You might have success using a normal (geared bike) freewheel or cassette removal tool, they have 8 or 12 splines of approx. that size.
cheaper bmx type freewheels often use weird and wonderful notchs to get them off (2,3,4 prong/slot type tools).
cassette tool.
freewheel tool
@BrickMan started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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You might have success using a normal (geared bike) freewheel or cassette removal tool, they have 8 or 12 splines of approx. that size.
cheaper bmx type freewheels often use weird and wonderful notchs to get them off (2,3,4 prong/slot type tools).
cassette tool.
freewheel tool