Depending on the printing material and the quality of the print, we have found that the sun gear can become stripped from the axle of the wheelchair. We have created a solution for this involving a 5/8 inch sized ratchet socket.

Dremel the socket to the approximate height of the sun gear (24 mm), and drill two holes in the side (9mm up from the bottom of the sun gear).

Insert the adapted socket into the hole in the sun gear (File is called, Sun_Gear_With_Holes_For_Axle)

Use two Number 6 screws to secure the socket to sun gear.

Procede with assembling the Hand Drive as usual.