Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-18-03, 06:29 PM   #1
darrencope
Senior Member
Thread Starter
 
darrencope's Avatar
 
Join Date: Mar 2003
Location: Perth, Ontario, Canada
Bikes: Colnago Classic, Kona Dr. Dew, Giant ATX 740, Bianchi Strada, Eclipse Time Machine
Posts: 338
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Stripped F. Derailleur Cable Anchor Thread

Hi all,

I managed (through my own stupidity) to strip the thread on the cable anchor bolt hole on my front derailleur (Suntour Cyclone M-II circa 1983). So now, I can't fasten down the bolt tight enough so that I can apply pressure to the cable...it just slips out when I move the lever.

My question - is there any way to fix a stripped thread like this? I have read about using Teflon plumbers tape to stop things from squeaking. Would a few extra layers of this help with my problem by "filling in" the threads? I'm doubtful, but it's the only option I can think of, short of re-drilling a larger hole and re-threading it, which I would like to avoid if possible (how easy is this to do on this type of aluminum?) Any other options, or should I just start looking to buy a replacement derailleur? If so, how do I tell what types will be compatible with what I have?

Thanks for any and all replies!

Darren
darrencope is offline   Reply With Quote
Old 10-18-03, 06:39 PM   #2
threadend
Career Cyclist
 
threadend's Avatar
 
Join Date: Feb 2002
Location: Michigan, USA
Bikes:
Posts: 551
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by darrencope
Hi all,

My question - is there any way to fix a stripped thread like this?

Your answer - re-drilling a larger hole and re-threading it
Darren
Investigate an SAE size thread slightly larger than the current metric bolt (or vice versa), you might get away with only running a tap and not have to drill the hole.

BTW - Be sure to use a fine, not course thread.

Best wishes, it worked for me when I did the same to my r'der.

T/E
__________________
2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
2000 Iceman Challenge - 2:49:18 - 1516 / 2,153
*estimated
threadend is offline   Reply With Quote
Old 10-18-03, 06:53 PM   #3
roadfix
hello
 
roadfix's Avatar
 
Join Date: May 2003
Location: Los Angeles
Bikes:
Posts: 18,557
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
You can drill through the hole and simply use a bolt, washer, & nut to secure the cable......or, you can maybe find a replacement here:

http://cgi.ebay.com/ws/eBayISAPI.dll...category=27950
roadfix is offline   Reply With Quote
Old 10-18-03, 07:27 PM   #4
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 2,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Rethreading a slightly larger hole should be trivially easy. You need to ID the screw size now used (probably 4 or 5mm x 0.8mm) and find a replacement screw the right length and configuration. The clamping washer may need to be drilled out as well. Once the screw is found there are standard tables of drill sizes used to drill a hole for a given size tap. Taps in the right size will be $2-4 depending on source, or as low as $1 from a few sites. Try to find a screw with an allen head for convenience. Do NOT use straight slot screw (unless hex head) and avoid phillips head as they tend to strip easily. Robertson head is great but few bike tool kits have the tool. You will need a tap holder, it is amazingly easy to cross thread the start on taps, though Al is not much of a problem, you can't do it with a wrench. Taps have square ends so a brace might work in a pinch. You do have a brace as in brace and bit (obsolete hand powered wood drill.)? Steve
sch is offline   Reply With Quote
Old 10-20-03, 07:39 AM   #5
lotek
Forum Admin
 
lotek's Avatar
 
Join Date: Dec 2001
Location: n.w. superdrome
Bikes: 1 trek, serotta, rih, de Reus, Pogliaghi and finally a Zieleman! and got a DeRosa
Posts: 17,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just buy a new one. They are not too expensive and
fairly common on e-buy.
Here are 2 that I found today. both less than $20.00, 15 should be
close to winning bid.

http://cgi.ebay.com/ws/eBayISAPI.dll...category=27950

http://cgi.ebay.com/ws/eBayISAPI.dll...&category=2904

Marty
__________________
Sono pił lento di quel che sembra.
Odio la gente, tutti.


Want to upgrade your membership? Click Here.
lotek is offline   Reply With Quote
Old 10-20-03, 11:07 AM   #6
Rev.Chuck
The Red Lantern
 
Rev.Chuck's Avatar
 
Join Date: Apr 2003
Location: Raleigh NC
Bikes:
Posts: 5,966
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Look close at the der., quite a few front ders. have a nut swaged in. On these you can rest the arm against a vice opened just enough to let the nut pass and tap it out then tap a new one in.
__________________
Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
Help out the forums, abide by our community guidelines.

I am in the woods and I have gone crazy.
Rev.Chuck is offline   Reply With Quote
Old 11-02-03, 08:44 PM   #7
darrencope
Senior Member
Thread Starter
 
darrencope's Avatar
 
Join Date: Mar 2003
Location: Perth, Ontario, Canada
Bikes: Colnago Classic, Kona Dr. Dew, Giant ATX 740, Bianchi Strada, Eclipse Time Machine
Posts: 338
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hi guys, thanks for all of the above advice. However, I've been putting off doing anything about this, and was thinking it's about time I did. Since I'm not too sure about doing this myself (don't want to ruin anything any more than it already is...) is it reasonable to take it to a shop for this type of job? Do they have the tools to rethread or whatever is necessary? I guess I could call the LBSs and see what they say, but I'd like your opinions too!
darrencope is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:29 PM.