MALE/FEMALE THREADED KNOBS

[morsa]

I thought it was black Delrin when I first looked at them. That's another choice in material and is really nice to work with!

I agree that plastics are an excellent choice for these items, as they are easy to machine and have several advantages over wood. I have worked with polyethylene (1 y 2) , bakelite (3) and corian (4),

but I have not had the opportunity to work with Delrin.
An easily available plastic is the high density polyethylene of the cutting boards. There is also the option, easily available today, to make them through 3-D printing.