Originally Posted by
dwengo
I'm renovating an old frame, I've removed the old bottom bracket but on one side there is a sort of... cap thing that I can't seem to get off, how would I go about getting it off, are any special tools required?
Yup.
You need a special tool to get it off. It's the worst tool ever made for a bike and the worst idea ever put on a bike...and there have been some real stinkers to compete with it! The tool
will slip off and you
will bash your knuckles. The cup is also on there tight so the tool will slip many times and you'll bash your knuckles many times. The thread is also a left hand thread so it righty loosey.
You can save your knuckles a but by using something like this to hold the wrench in place
2015-03-14 11.28.26 by
Stuart Black, on Flickr
2015-03-14 11.21.32 by
Stuart Black, on Flickr
The parts are from old bike parts...an solid hub axle, axle nuts, the top of a kickstand and a lock ring. You can substitute a large fender washer for the lockring. Some clever monkey at my co-op improved the tool since the picture was taken by using a right hand cup screwed into the frame on the other side to keep the tool centered. It's still a horrible tool to use but at least you don't bash knuckles.
You might just want to take it to a shop and pay someone to take it off.
I would also suggest
not putting it back on. Get a cartridge bearing bottom bracket and don't look back.