1/4" knob for CNC hold down clamp

Scaled the knob up to fit 1/4" hardware, the other part of the hold-down works with 1/4" bolts with only a light filing to slightly widen the slot.
The 1/4" nut has to be tapped into the knob with a hammer or pressed into place using a vice, it's a tight fit and the nut will not fall out or require glue to hold it in place.