You need some M3 bolts with nuts.
2 M3 (8mm) bolts with nuts in the gear. You put the nuts in the gear central hole and you screw the bolts in. They will be tight on the scope shaft.
2 M3 (30mm) bolts with washers and nuts to hold the motor.
You need a small belt that you cut and glue at the right length.
And I use a commercial gear for the motor.
The cap covers the end of the scope shaft.
Many arduino projects use step motor as electronic focuser.
I used EQFocuser and I’m fully satisfied.
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