picked up a used 8274 pulled it all apart except for the rod that the break is attached to.. i moved the inside flat plate out of the way but the shaft will not budge. when i watch the youtube video they show the thing sliding out with the push of a screwdriver. not mine!! I've moderately bang on it (from the inside)with a bloc of wood and a hammer and its not budging. any advice from those who have been there done that?