Any cheap Shimano MTB thumb shifter should work.
Why not get those cheap Altus rapidfire shifter? they'd work and easy to obtain.
@edscoble 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.
Any cheap Shimano MTB thumb shifter should work.
Why not get those cheap Altus rapidfire shifter? they'd work and easy to obtain.