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Should I do this?

Old 04-28-10, 04:07 PM
  #1  
Amani576
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Should I do this?

Alright, as some of you may know... my tandem has a horrifically stuck captains seatpost. So bad it's depressing me honestly. The more I work on it, the less desire I have to put effort into it, simply because the post is frozen in there solid.
I sawed the post off, there's about 3/4" to 1" of seatpost above the top of the seat tube. I've sawed two lines down it that I know are all the way through in some spots (but I've been extremely careful, so I'm not 100% positive they are all the way through). So... my query is...
Should I just pour ammonia down the seattube/post until it fills it up? Then let it fester for a week or so? I don't think ammonia will oxidize steel, but it will kill aluminum oxidation, so why not?
Right?
This is too frustrating.
-Gene-
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Old 04-28-10, 04:17 PM
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Go for it, you have nothing to lose and a nice tandem to gain.........and finally ride.
If it does not work, just go to plan "Q"!!

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Old 04-28-10, 08:01 PM
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i hacksawed a stuck seatpost from the inside. i cut it into probably 8 smaller pieces and kept curling it in with a pliers until i could finally get all of it out. it took about 2 hours of sweat, but it worked and nothing bad happened. you just have to be careful to saw evenly and not into your frame. it sounds worse than it is.
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Old 04-28-10, 08:05 PM
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Don't let it bum you, Gene. You can do this. You built a bike from scratch at 19. You can do this.
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Old 04-28-10, 08:12 PM
  #5  
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+1 Cut more slots. You are almost there!
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Old 04-28-10, 08:26 PM
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+1, Go for the ammonia. Then try more cuts and working it. Once it breaks lose a little, you're home.
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Old 04-29-10, 06:48 AM
  #7  
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I think I'd try to get some kind a waterproof plug below the post; like a piece of sponge or something, followed by melted wax, something to make a really good seal and contain whatever chemicals you pour down there. Once that's done, go for the ammonia. If ammonia doesn't work, you can always escalate to nastier chemicals. Lye would eat the whole post out of there. It's not an aluminum frame, is it?
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Old 04-29-10, 07:38 AM
  #8  
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Nope. Steel.
One benefit to this whole situation, which I hadn't mentioned, is that my seat tube is JUST the seat tube. There's no vent holes down into the eccentric or into any other tubes. The transverse tube (running from the middle of the headtube to the base of the stoker seat tube) was bored out during construction and welded around the captains seatpost, the same with the top tube.
Well... Thanks everyone. I'll try it. Maybe it'll work.
I may try the lye, RHM... but that stuff scares me. But if I have no other choice, maybe.
-Gene-
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Old 04-29-10, 08:01 AM
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Originally Posted by Amani576 View Post
I may try the lye, RHM... but that stuff scares me.
Good, I'm glad to hear that. It is scary stuff. Very useful if you want to get rid of some aluminum, though. I've used it to adjust seat post sizes with good success!
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Old 04-29-10, 10:09 AM
  #10  
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If that doesn't work, you could ream the seatpost out. If you want, I can help you find the tools. I used a micro-adjustable reamer at a shop I worked at, and I was able to locate a similar one on the web. I didn't buy it. I was satisfied just to find it.

You may have to buy two or three reamers, so this will be expensive and time consuming, but you WILL get it out by shaving it to obliteration.
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Old 04-29-10, 10:17 AM
  #11  
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Originally Posted by noglider View Post
If that doesn't work, you could ream the seatpost out. If you want, I can help you find the tools. I used a micro-adjustable reamer at a shop I worked at, and I was able to locate a similar one on the web. I didn't buy it. I was satisfied just to find it.

You may have to buy two or three reamers, so this will be expensive and time consuming, but you WILL get it out by shaving it to obliteration.

Very good point. Harbor Freight sells a set of adjustable reamers for ~$50. You could start with the smallest and work your way up. The image beow is similar. The work computer doesnt open Harbor Freights website:

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Old 04-29-10, 10:34 AM
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Harbor Freight tools are often craptacular. You think I should buy this set? I wouldn't use it much. But I bought a cable cutter from them, and my cable dented the cutter's jaws. Worse than useless.
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Old 04-29-10, 10:50 AM
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I've always had the feeling that you get what you pay for with Harbor Freight


OP, have you attempted to put the Seatpost in a vice fixed to a bench and pulling on the frame with all your weight? or possibly with a car
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Old 04-29-10, 11:39 AM
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Originally Posted by noglider View Post
Harbor Freight tools are often craptacular. You think I should buy this set? I wouldn't use it much. But I bought a cable cutter from them, and my cable dented the cutter's jaws. Worse than useless.
Originally Posted by Zaphod Beeblebrox View Post
I've always had the feeling that you get what you pay for with Harbor Freight


OP, have you attempted to put the Seatpost in a vice fixed to a bench and pulling on the frame with all your weight? or possibly with a car

Your both right in regards to Harbor Frieght. Depending on how often I'll use a tool its either HF or Craftsman. One time tools come from HF. Multi use tools come from somewhere else.

ZB, I've done the bench vice thing.....sometimes it works sometimes it doesnt. I've had a few posts twist in the vice!!!1
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Old 04-29-10, 04:50 PM
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A minimally destructive method I used to free a very stuck 350mm post from a Schwinn High Sierra was to drill a hole into the lower side of the BB. Using a 1/4 inch steel rod and hammer, I drove the stuck post out. This was after unsuccessful attempts at penetrating oil and the bench vice.
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Old 04-29-10, 05:08 PM
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Originally Posted by raverson View Post
A minimally destructive method I used to free a very stuck 350mm post from a Schwinn High Sierra was to drill a hole into the lower side of the BB. Using a 1/4 inch steel rod and hammer, I drove the stuck post out. This was after unsuccessful attempts at penetrating oil and the bench vice.
I'd consider something like that (as a last resort), but since I lack an entrance into the seattube in any direction other than the top, it just wouldn't be practical.
-Gene-
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