Ian Raleigh wrote:
Blast the surrounding alloy with carburettor cleaner! The alloy will expand quicker than the steel bolt,
It will get really really cold and could/can crack the corroded in bolt, then use the stud extractor.
Thanks for this suggestion. Appreciated.
Had already been regularly been blasting it with a pressurised can called "Crack It" - which I picked up at the local motor spares shop that they convinced me to buy instead of Plusgas. It does come out at high pressure, and noticeably pretty cold. (I wouldn't spray it directly on my fingers).
After having done this for a few days, I was then going to alternate heating up the whole joint with a hairdryer (so as not to stick a bare flame on it), and them blast it with the Crack It stuff to cool it right down again and crack the corrosion. A few treatments of this, then was going to try to turn the Torx bit that I've hammered into the grub bolt to see it will turn....
The reverse thread drill bits have just turned up too, so if the Torx bit didn't work, was going to drill it.
Sound like a plan?
Rossin Concept MTB 1990 - Full XTR M900
Litespeed Ocoee Titanium MTB 1992 - Grafton / Bullseye / Syncros / XTR
LeMond Z Team Issue SLX 1991 - Full Corsa Record / Sigma
LeMond GAN Team Issue GLX 1993 - Full Dura Ace (7400)