Cleaning up the threads in the F/R 12/4 hubs AM221/AO61.

[austinbrit]

Is there any easy way to clean up the very fine threads that the hub caps(AM25/AO62) screw into.
Have tried using a scriber, unsuccessfully.
I am not sure what the size/thread is and would there be a tap to fit it?
Cheers
Paul

[SimonB]

If no one has the actual answer to this I suggest you buy some thread gauges, find out the tpi and profile and then get the appropriate thread file.
Regards
Simon

[austinbrit]

Another suggestion was to use a Dremel and using the very thin grinding discs and the job is now done. You just need a steady hand.