Vintage Synth Repair

here's a more general techie question...i have an old synth with some voice cards and one 
may be shorted out.  problem is, i can't get the damn screws off of the cards to take them 
out and see which of them (if any) work or don't work.  

is there any good trick to loosen the screws without potentially damaging the voice cards?

>  is there any good trick to loosen the screws without potentially 
> damaging the voice cards?

There are some liquids that might help, but if it is really stuck; 
drill a *very* tiny hole in the middle of the screw.


tw.  :)

"Those great moments come when musicians are playing together..."
(Bob Moog)