The bottom bracket on my Diamonback Wildwood w/ shimano sealed cartridge won't budge. I have removed both cranskets and tried adjusting it on both sides. I laid the bike on its side, inserted the bottom bracket tool into the splines, stepped on it with most of my weight to keep it from coming out, attached a 12" wrench to the bb tool, and pounded the end of it with a hammer. The most that happens is either the tool pops out of the splines or the adjustable wrench gets loose around the bb tool.
I don't remember it being this difficult last time I adjusted my bottom bracket (~6 months ago). How can I get it to come out?