Holding fragile parts in a vice can damage them because of the hardened steel faces. For this reason I decided to make some aluminium covers to act as sacrificial parts. These parts would be held on via magnets to ensure they don’t move.

To aid holding onto round parts I milled out a “V” on one surface, this gives three points of contact, enough to hold onto a part.

First task was to square up the aluminium faces. I decided to use the fly cutter for this, purely for the amazing surface finish it gives.

Aluminium surface after being cut
Both parts finished.
Due to their symmetrical shape storing them while not in use is easy.

Due to the thick contact face of the jaws, if the surface becomes damaged a shallow pass with a fly cutter should provide a smooth surface again.