Lazy Susan - Ball Vice Adaptor

The black spacer plate in the photos below is to allow the  lazy susan to be bolted to either the ball top or the index plate. To use the index plate, I would suggest using the cutouts version which should make getting the longer bolts in and out of the vise. 

Build instructions:

1. Print the spacer and the lazy susan base of choice. In the 4 bottom protrusions, there is allowance for M3 x 5mm (diameter) x 6mm long heatset inserts. Either drill out and glue these in or heatset them in, and put an M5 hex nut or Nyloc nut in the centre hole (not shown in the bottom view photo but visible in the assembled photo). 
2. Drop some M8 SHCS into the four locating holes in the adaptor plate. If using the index plate, use M8 x 25 or M8 x 30, if not using the index plate, use M8 x 20. Once these are in, support the adaptor plate from underneath, and pop in the lazy susan base. Flip over, holding together, and screw in 4x M3 x 25 SHCS into the four recessed holes on the base that match the locating protrusions. Flip back over, and bolt down using the M8 bolts. Install the ball bearing balls (5.5mm seems to work well) and lube with silicone grease.
3. Place the top plate onto the bottom plate, and screw down the M5 screw from the top to lock the lazy susan together.

I haven't got photos of the scalloped base, as at the time of writing it was printing.