After removing the plunger cap on the rival knockout about 15 times the tabs on mine started to wear down so I took to fusion to design a new one. If you want this printed message Dart Nerd Customs on Facebook. This is currently untested but it should work.
Fusion 360
First I created a sketch of the bottom surface with all of the various segments I would need to extrude. I then took height measurements of everything and extruded it
Sketch
Without the clips
then I took some more measurements and designed the clip. Then just a pattern and you are good to go.
Category: OtherThe author marked this model as their own original creation. Imported from Thingiverse.