One thing I have not seen is a discussion on is the wedge
at the end of the scales.

What is the primary purpose of the wedge? If it
was only a spacer it would be a spacer.

What are they made of and why?

How to size?
To glue or not to glue?
How thick?
How much wedge?
Thicker at the top?

I ask because I have a good shaver from ebray that
has ugly but serviceable scales and this detail does
not seem to be well addressed the way pins and
domed washers are.