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Had this problem recently and ended up hacking two parallel sides off the bolt head to get a spanner on it
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Any ideas anyone?
- Just realised where you said ‘ok seat post’ it meant ‘on seat post’. Do as Alban suggested, should be quick work with a file or dremel.
Leaving this technique in case it’s useful to someone in the future.
Cant say if it’ll work for you, but as an idea here’s something I’ve done as a last resort on rounded NDS crank arm pinch bolts, using a dremel with a cutting wheel and some flat needle nose pliers:
1) Locate the exposed threaded part of the bolt visible between the opposing plates of the seat tube collar.
2) Use the dremel to cut the bolt as close as possible to the plate nearest to the head of the bolt. Triple check if you’re not sure because you don’t want to mess this up. This should release all tension on the bolt head and it should pop out.
3) Cut a flat surface onto a side of the remaining threaded bolt. Try to get it as even as possible, and do not take a lot of material off.
4) Use pliers to grip and rotate the bolt enough to allow you to cut a flat surface on the opposite side of the bolt. You might need wd40 to help loosen the bolr.
5) Use the pliers and continue rotating the bolt out towards where the head was, until it eventually comes out entirely.
6) Swear mightily at the bolt and high five the nearest person or pet.It’s painstaking, it sucks, but it’s worked every gdm time I’ve had to do it.
- Just realised where you said ‘ok seat post’ it meant ‘on seat post’. Do as Alban suggested, should be quick work with a file or dremel.
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Alban
Eseman
@Weepsie
Need some help here and asked a few places.
Argon 18 kryton frame. Bottle cage bolts ok the seat tube are completely seized. The bolt heads are also rounded out and they're those sort of flat/mushroom type so can't grip them with a vice or anything like that.
I've tried ez outs and got nowhere. Pilot hole is always too big or small and can't get the drill to the lower bolt anyway.
Can't cut into the bolt to get a flathed onto it. Trying to now maybe cut the bolt head off and push rivnut into frame but even that's not sttaighword.
Any ideas anyone?