Me too, had bearings 'stuck' in the engine, couldn't get them out and found that more time in the oven was all it took. You should be able to LIGHTLY tap the crank case on a wooden cutting board and the bearing will fall out. 325 sounds high to me (mine worked at 250) so don't go any hotter than that, just put it in longer if need be.

Oh, and by the way...the screwdriver thing is a BAD idea. Don't ever hit your bearings (ESPECIALLY the good ones) with hard and pointy objects. They spin over 10,000 rpm! A small dent could lead to a much bigger problem. So now you know