After crushing my hand in the military, I've always had an issue with the typical "round ball" style shift knobs in my cars. So, i got an idea and just went with it. I got a piece of solid oak "Nosing Molding" from Lowes for $2, and shaped it with a sanding spindle on my DP. I drilled a hole with a forstner bit and hammered a hex nut in the hole, secured it with a little JB Weld, and sanded it. Starting with 100 grit and ended with 600 grit. Stained and Varnished, and sanded again with 2000 grit until it was smooth as glass.