I've got an FSA MegaExo bottom bottom bracket that seems to have gone bad. I've head that FSA doesn't have the greatest bottom brackets, so I was going to try to replace it with this Shimano bottom bracket, unfortunately I've run into trouble. The bottom bracket tool I'm using seems to be a bit too big for the bottom bracket I have. When I apply force to remove the bottom bracket, the teeth of the tool dig into the bb's teeth and end up just deforming the teeth of the bottom bracket.
So my question: is there another way to remove a threaded bottom bracket, or do I need to buy a new tool? If the latter, do the bottom bracket tools come in different sizes? Which size should I buy?
I've posted a picture below in case it'd be of any help.