Current Projects chat and miscellany

yes. you need the crown race reamed down to 26.4mmish and the headtube (if also JIS) reamed out to 30.2mmish. basically, you just need the headtube and fork crown reamed and faced as would normally be done for an ISO headset.

or just get a jis headset

It's just the fork. Cups are already pressed and all of that is the correct size... the frame is a track bike, but not NJS. think I'm gonna go at the fork with a magic marker, caliper, and file.