Those pin style in the pic look pretty cool. I was just trying to keep the price down. Replacement knobs are $7. In a pinch you can use a 5/16 course nut with a washer to secure in place. I have an LSR pin style I have never opened if you want one. Making the pin style with the machine work would add quite a bit to the cost. So I have just went with the twist knob style. I have cut a few hand knobs from 1/2 aluminum to thread. Drilling the small hole and spring will be next on the list of things to do.