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How to attach lever / crank / arm to motor shaft?
► ring shaft retainer
3€ many size available
just bolt your arm (the screw head are conviently hidden into the counterbore holes)
► on shelves product:
► Bike Crank Arm => only for Ø23,7mm shaft
Mountain Bike Left Crank Arm for SHIMANO amazon 20$
aliexpress Hollow Bicycle Left Crank Arm Mainly for SHIMANO 14€
► Wormdrive gearboxes can be hollow shaft or solid shaft, so the approach to attaching levers is different.
For solid shaft gearboxes that are keywayed @noorbeast suggests the easiest way to attach a lever is to grab the correct sized and length Mild Steel, Black Oxide Plating Rigid Couplings, which have the keyway and grub screws, and just weld the lever on the end: http://www.xsimulator.net/community/threads/using-chinese-actuators.7304/page-3#post-86033
Another option for solid shaft motors are these bolt on flanges: https://www.robotshop.com/nl/en/14mm-set-screw-key-steel-hub.html
As @Nick Moxley explains with hollow shaft motors you can use the correct sized threaded rod through the hollow shaft and weld nuts to it to secure the levers: http://www.xsimulator.net/community/threads/using-chinese-actuators.7304/page-2#post-85902