if it hasnt been off for a long time crud and rust may be hampering it?try knocking it back in,and out,and in and out,,you might gain a little each time?try and get some sort of penetrant on the axle without getting it into the brake area,if you pulling the axle by hand the wheels weight will hamper you,if you knocking it with a hammer it still helps to take that load off it,find an earlier swing arm where the ends arent solid but have removeable end stoppers.