9 or 10 spd mech will be fine - it's the shifters that determine the cable pull.
10 spd cassette only really compatible with 10spd shifters and definitely only with 10spd chain.
Just replace the mech.
@BringMeMyFix 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.
9 or 10 spd mech will be fine - it's the shifters that determine the cable pull.
10 spd cassette only really compatible with 10spd shifters and definitely only with 10spd chain.
Just replace the mech.