Stripped screw on bolt-on derailleur hangar?
#1
Senior Member
Thread Starter
Join Date: May 2010
Location: Boston, MA
Posts: 106
Bikes: 1981 Trek 613, Bianchi Ibex, Bianchi Fixed, Schwinn Tempo, nothing that would get stolen (sigh).
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Stripped screw on bolt-on derailleur hangar?
I'm trying to rebuild an old Takara 10 speed. The bolt-on derailleur hangar is misaligned so that I can squeeze a wheel on. I've tried to remove the screw that keeps the derailleur misaligned every which way, PB blasted it, but no luck. See below.
Any way to salvage it or should I figure out a way to chop it right off? I have other old derailleurs kicking around that I could swap out.
Thanks for your help.
Any way to salvage it or should I figure out a way to chop it right off? I have other old derailleurs kicking around that I could swap out.
Thanks for your help.
#2
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,695
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5773 Post(s)
Liked 2,571 Times
in
1,423 Posts
File or saw off the head and pop it through. Yoy might be able to salvage the nut or you may not, but there's plenty of RDs with these hangers in bike shop junk boxes so scavenging a new and nut shouldn't be hard.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
#3
Junior Member
Join Date: Jun 2010
Location: Boston, Massachusetts USA
Posts: 6
Bikes: Litespeed Ultimate (1995), Giordana Pista (1996), Zeus Criterium (1970), Zeus Pista (1970)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Get a small torch and heat it up until you can see the redness in the bolt. It will come out like butter.
#4
Senior Member
Thread Starter
Join Date: May 2010
Location: Boston, MA
Posts: 106
Bikes: 1981 Trek 613, Bianchi Ibex, Bianchi Fixed, Schwinn Tempo, nothing that would get stolen (sigh).
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks, should be easy.
#6
Senior Member
Join Date: Jul 2008
Location: Knoxville, TN
Posts: 909
Bikes: Klein
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I can't imagine being able to apply enough heat to the bolt to loosen it without ruining the paint.
Those hangers have little nibs on the back that are supposed to locate the hanger in the dropout. Looks like this one has rotated enough that the nib is on top of the dropout. So the first thing I would try is to remove the derailleur from the hanger and hit the hanger with a hammer so that it rotates back into alignment. That might relieve enough tension that you can remove the screw.
If that failed, I'd cut a slot in the bolt head with a Dremel tool with a cutoff disc or a a hacksaw blade. When the slot reaches the hanger, you should be able to inset a flat blade screwdriver in the slot and twist the head off.
Those hangers have little nibs on the back that are supposed to locate the hanger in the dropout. Looks like this one has rotated enough that the nib is on top of the dropout. So the first thing I would try is to remove the derailleur from the hanger and hit the hanger with a hammer so that it rotates back into alignment. That might relieve enough tension that you can remove the screw.
If that failed, I'd cut a slot in the bolt head with a Dremel tool with a cutoff disc or a a hacksaw blade. When the slot reaches the hanger, you should be able to inset a flat blade screwdriver in the slot and twist the head off.
#7
Certified Bike Brat
Join Date: Jan 2011
Location: Montreal, Quebec
Posts: 4,251
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 6 Times
in
6 Posts
So maybe I`ll state the obvious. The centre of that has been messed up from trying to use a phillips screwdriver on it but the corners of the bolt head are pristine. Doesn`t anyone own boxend wrenches?
Yeah - a torch will screw up the paint. On the other hand a couple 10mm boxend wrenches should have that out of there with very little effort.
Yeah - a torch will screw up the paint. On the other hand a couple 10mm boxend wrenches should have that out of there with very little effort.
#8
Senior Member
Thread Starter
Join Date: May 2010
Location: Boston, MA
Posts: 106
Bikes: 1981 Trek 613, Bianchi Ibex, Bianchi Fixed, Schwinn Tempo, nothing that would get stolen (sigh).
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
^ I can't believe I didn't think to try the 10mm wrench...
#9
Senior Member
Thread Starter
Join Date: May 2010
Location: Boston, MA
Posts: 106
Bikes: 1981 Trek 613, Bianchi Ibex, Bianchi Fixed, Schwinn Tempo, nothing that would get stolen (sigh).
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Yup, worked like a charm.
#10
Senior Member
Join Date: Feb 2011
Location: Baltimore, MD
Posts: 234
Bikes: Surly LHT, Dahon Jack D7 & a cheap xmart MTB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
why not use a ratchet/socket? I had the same issue with screwdrivers. Those things are way to tight for any screwdrivers to tackle. Looks like the nut seems to be fine. You may have to use a 5-10 mm socket or wrench.
Good luck.
Good luck.
#11
Senior Member
Join Date: Feb 2011
Location: Baltimore, MD
Posts: 234
Bikes: Surly LHT, Dahon Jack D7 & a cheap xmart MTB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Oh...never mind. Glad you were able to take care of it :-)
Thread
Thread Starter
Forum
Replies
Last Post
agenkin
Bicycle Mechanics
29
04-15-15 09:14 AM