Quote:
Originally Posted by 350TSS
If you feel that the head is more likely to strip than come undone as there is a bit of play in it and you have applied the penetrating oil and even a bit of heat, put some valve grinding paste in the head of the Allen bolt this will take up any slack and allow the Allen key to work.
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+1 for this tip, not actually done it myself (despite being in engineering for 40 years) but I have seen it done (on YouTube) with good results, when I have had a really stubborn Allen screw I tend to use a socket type Allen key - if possible 3/4" drive - you get much more force through a bigger drive, if you only have 1/2" drive try using a long pipe on the ratchet handle to get more force on it.
Good luck.