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I've got mine here in my hand and by the looks of it there is no reason you couldn't make one by using a dremel or a hacksaw. By the looks of it, it must be 1/32" or so give or take. Try using a finishing nail for the shaft then glue a piece of wood or plastic on the end for a finger knob.
I like the idea of splitting a finishing nail down the middle with a handheld cutting tool rotating at 30,000 rpm. If you don't hear from me within 24 hours I got no fingers left for typing
lol oh come on its not that bad. I made one that way for a quadrajet carburetor one time and its easier than you think, as long as you use a bench vise to hold the nail and steady your hand.