Second day of cleaning up M900 cranks

The first two sets of test subjects spent another night in the tumbler after some hand sanding of the trouble areas.

 

The ends of the crank arms are proving to be the most difficult and require the most work. I can't wait until I have my new Foredom flex shaft tool to take a one more bit of manual labor out of this process.

The first two cranks are coming along nicely. I think some more bench time to finish cleaning up the ends and some other local imperfections and tonight I can try them with the finer ceramic media to attempt a polish finish.

Little more work required on the non-drive side arms.