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Stuck Setscrew in Aluminum Knob
I need to remove an aluminum knob from a radio, but the Allen setscrew
is stuck solid. I've tried: -- WD-40 -- Kroil -- an Allen wrench with a long handle (bent handle) -- an Allen 1/4" drive socket (twisted the Allen part) -- blocking up the knob with rubber blocks and beating on the Allen wrench while turning -- heating the Allen wrench with a heatgun while engaged with the setscrew and turning -- heating the Allen wrench to 450 degrees and then inserting it into the setscrew and turning All this and the bloody thing is still stuck solid. As a last resort I know I can drip 1-mole nitric acid into the hole, which would eat the steel setscrew and leave the aluminum relatively untouched. This I have done on aluminum car engines with snapped-off manifold bolts and it works great. However, I can think of a bunch of ways this could go wrong when applied to a rare radio. I would greatly appreciate any ideas. Thank you. 73, Jeff N6MNI |
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