Here the ebonite rod is chucked up in the lathe. The smaller rod sticking out of it will be the delrin tenon. I use delrin material because it’s always slippery and won’t stick to the mortise over time.
Here I’ve glued an extension to the shank. I’ve oriented the grain on the extension so that it will run straight down the shank for the best display. Between the two briar pieces is a thin slice of ebonite to give it that black stripe.