Another suggestion, spray liberal amounts of WD-40 or any penetrating lube (assuming you'll also be replacing the bearings since pen lube can damage them). Let them sit for a while, then continue tapping away.i knocked in pretty strongly, but it won't move at all( i will try again later
looks like previous owner didn't care about bike at all. the screw that i unscrewed looked pretty rusty. not really worn-out, but it was obvious that the suspension isn't the thing, the owner took care about