A length of copper pipe works, even if you don't cut slots into it. Just pop it into the headtube diagonally and tap it with a hammer rotating to a new spot if you see any movement in the cup.
@ffm 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 length of copper pipe works, even if you don't cut slots into it. Just pop it into the headtube diagonally and tap it with a hammer rotating to a new spot if you see any movement in the cup.