It's just carving for fun. It's made out of mahogany, soft and easy to work with. I made a ton of furniture out of mahogany over the years. The trick is getting the threads tilted at the right angle so the grip fits like a gun in your hand. Never got it perfect like a factory shifter with one piece of flat stock through the center with two halves of wood. I couldn't make it thinner because of the female threaded insert which is 1/2" rod drilled and tapped three inches long for strength. It was made to match this steering wheel for a different car I built years ago. It's coming back off and I'm installing a whole new American shift kit with an old school hurst knob. Thanks!!.... UlliI made a couple pistol grip knobs for my ratchet shifters... but they are not in the same universe as Hey-O's!
They work fine for me though.