how do you do it?
Hammer them out from the inside of the cup with a drift.
The external BBs I've seen are bearings pressed in to an alu cup. There's little magic to it.
Your next challenge is to press the new bearing in straight - if that's what you are intending on doing.
@Howard started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
how do you do it?