Maybe I should be more optamistic. Or not.

Just can`t see a screwdriver having the leverage to loosen something that was forced in till it snapped. We have a souvenier at the shop from a former mechanic. Its a Park Tool crank puller firmly fixed in a non-drive crank. The guy apparently got carried away and instead of tightening the inner screw to press against the axle - came onto the outside shell that threads into the crank arm.

Well nothing broke and I`m surprised the threads in the crank arm didn`t strip - but no-ones been able to seperate those two pieces in the past two years and sometimes we try just for fun. A socket and extension bar and vice aren`t enough there so I guess I`m not too expectant for results with a screwdriver.

But I have split crank arms as described when nothing else worked including a wheel puller.