A trick is to pour a few kettles of hot water to help expand the metal a little.
For the cartridge BB try one of these, or if you are doing this regularly https://www.machinemart.co.uk/shop/product/details/clarke-cew1000-electric-impact-wrench?da=1&TC=SRC-impact
@lynx 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.
A trick is to pour a few kettles of hot water to help expand the metal a little.
For the cartridge BB try one of these, or if you are doing this regularly https://www.machinemart.co.uk/shop/product/details/clarke-cew1000-electric-impact-wrench?da=1&TC=SRC-impact