Join Date: May 2020
Location: mays landing nj.
You can get thumb screws from either Bolt Depot or Micro fasteners. They may carry the threaded knobs too.
I also make my own threaded knobs. Saw or turn a circle, lay out the 5 points, connect the points to the center.
Mark each side of this line how you want the finger grips to look and feel. Usually the perimeter fingers are thinner ,the hub area would be wider. After sawing , sand the sharp edges.
I make my knobs round, then on a metal lathe I use a knurling tool to raise the knurls. I realize few of us have metal working tools, just noting another method.