Nothing better to do while home ill so... stink up the air with epoxy puddy and make TTL ring for my Pentax 6x7.  Crude, but it does work and last I checked that a used one runs for about $80... totally happy with the results.

Method is to cover the lower portion of the knob, sculpt the size, press out the top to help it lock to the top, and cut away bit while still soft.

So far is a wood right hand grip from oak, a repaired from broken TTL prism with a minor dent banged out and a epoxy clay TTL ring.