C Clamps
thingiverse
I placed a nut up next to the knob like it show's in the picture or you can use super glue the knob. You will have to use a nut or glue because I made the knob with a lose fit You will need the following to complete : 1/4-20 Nut's x 2 1/4-20 Carriage Bolt 2in 3in 4in
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