My search for a small tapered mandrel for odd aspect ratios like 8 x
5 mm and 9 x 5 mm has been unsuccessful. Rio Grande has one mandrel
which is 11.75 x 8.5 to 21.5 x 17.5, but the size is too large.
Remodeling bezels from scratch is too labor intensive when a piece of
tubular material could be formed over a tapered mandrel to create an
open bottom setting.
Hopefully there is a supplier for a set of tapered mandrels with
varied aspect ratios.
Thanks for your consideration.