Given that it's so thick, why not use a combination.
Drill the centre out to make it thinner, then use caustic soda.
?
@hugo7 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.
Given that it's so thick, why not use a combination.
Drill the centre out to make it thinner, then use caustic soda.
?