Mill round slot in master cylinder 10 of 12

I used 400 grit on the aluminium mandrel, then carefully finished with a mini piece of 600 grit wet dry sandpaper.

The other portions turned on this mandrel are not important, it was just something I had laying around.

The rest of the bores anodizing was left untouched except for the first ~ .125".

I made the mandrel ~ .125" deep at first, but found out it was not deep enough because of the bores chamfer. I then made it ~ .1875" deep which gave me ~ .125" on the bore.

Y13-12-23