that is a possibility Mark granted,
many metals are "case hardened" by repeated heating and cooling so shouldn't really cause any damage to your allen tip
but if your rounded screw is in a expensive part it may be better value to sacrifice an allen key or driver than the part it self
I have a set of old allenn drivers (very old RW racing ones that I keep for that purpose ) don't need then very often but did allow me to remove a Loctited screw from my expensive xray F1 car without having to resort to a dremel and the risk of marking the carbon chassis
as I said proceed with caution at your peril (also like the idea of using a TX or torx bit which may give a bit extra "bite " when applied
regards dave
|