I need to decrease the OD of an aluminium shaft from 1/4" to 6mm. Sounds silly but I’m changing a part in existing device and it receives a sprocket which I can’t modify. Unfortunately I can’t just chuck it into a drill and have a go at it with a file. It has a shape requiring a fixture (already made one [DIA 32mm]).
Can anyone with a (university/work) access to a lathe help me?