Converted a seig X1 Super to cnc to produce parts in Steel Aluminium Wood and Acrylics and the process for holding material to be milled overkill in many cases. Had a couple of cheap chinese hold down clamps about so designed this to be cut in metal on the mill, but after printing the prototype in PLA and testing fit metal is again overkill so now using to hold Woods and Plastics while milling. Fixings are 4x 8mm M3 or M4 screws and nuts.
2 minutes to design in Tinkercad so easy to change for different sized slot tables or clamps. is public so just search for
Hold Down Mount on Tinkercad