Metal detector pole handle. Diameter of holes 22,1 mm x 55 mm depth.
Print with support. Alu. poles 22mm can be glued in.

Edit1: added a grip with hole 15,1mm bottom and 21,1 mm top shaft.
You can buy a 2nd hand golfclub of 15mm for this one.

Edit2: Made one for XP Deus. You can buy a unit-holder for €11,50 and it fits exactly in the handle.