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after breaking four seat lug bolts..(7 posts)

after breaking four seat lug bolts..colker
Feb 8, 2002 5:38 AM
want to try something new.don't know what's going on but it's an older pinarello with lugs and the bolt threads on the seatlug. then it breaks and it's a time consumming operation to take it out. looks like this time the remaining part is stuck in the the lug.still don't know what to do to remove it.
decided to install a campagnolo "female" plug with the thread so if it breaks it's easier to swap it. the post goes tight in the frame and nothing seems too weird. any ideas?
thanks
re: after breaking four seat lug bolts..DINOSAUR
Feb 8, 2002 7:20 AM
I had a similiar problem, I just dragged my bike down to my LBS and they drilled out the stuck lug and retooled a new seat binder bolt. You might think about going to a flip lock binder bolt....
re: after breaking four seat lug bolts..Crankist
Feb 8, 2002 7:23 AM
Removing the broken bolt can be done by drilling and tapping the broken "stub" for a smaller socket
head cap screw and drive it thru using the new head. If it needs to be backed out then LH thrds.
are required. SHCS are normally grade 8 which could solve your problem of breakage, using a
new one as a replacement bolt. I've heard that quick-lock clamps offer more clamping force so
perhaps that option could be fitted. Finally, consider slipping a cut-to-length thin-walled alum. tube
over your seatpost to maintain seat height without having to clamp so tightly.
Mike
thanks crank & dino:colker
Feb 8, 2002 8:39 AM
lbs guys drilled the remaining bolt out. i have now a steel stem bolt on the same thread.
i'll look for a reflector clamp to help the slipping prblem. part of it comes from the shinny surface on the record ti post...while at the lbs i bought a sele italia turbo saddle. hmmm... more comfort than flite and avocet o2.
Easy Outgrzy
Feb 8, 2002 9:26 AM
Dunno where you're going to find LH threaded cap screw or the tap required as in your post. Much easier is to use the tool designed to do this called and "Easy Out". You drill a pilot hole in the remaining stud the use a special ream/tap type of tool that has a coarse LH threading like a tapered drill bit to remove. On small bolt sizes that are really stuck you can snap the Easy Out.

Ultimately it sounds like the binder bolt is way under sized or far to much torque is being applied. I'd chase the threads with a tap and use some grease or drill and tap to a larger size. Seems like the Campy seat post is problematic - it's frequently a reported problem here. One could try using some valve lapping compound to increase the friction between the post and the tube.
Easy Outcolker
Feb 8, 2002 9:57 AM
i guess that's why the post was cheaper then the steel daytona.everytime i buy titanium i have trouble...even when it has campagnolo record written all over it.
i tried not to torque the bolt too much and it slips. there's no grease on it.
i know i'm destroying that lug thread bolt by bolt.
Easy Out -indeedCrankist
Feb 8, 2002 10:30 AM
Yes, EZ-outs work well, but yes, can break easily. Here (at work) in the machine shop we often use the
LH thrd. for that purpose. I sure you're correct that for home stuff EZ-Outs are the way to go if the bolt can't be turned thru.
Mike