Gear and Mount for Slip Ring

A gear designed to work with [this slip ring](https://smile.amazon.com/Logisaf-300rpm-Circuits-Capsule-Equipment/dp/B01K48S6I0), along with a mount and gear to use with a 28BYJ-48 Stepper Motor such as [this one](https://smile.amazon.com/TOOGOO-28BYJ-48-28BYJ48-4-Phase-Stepper/dp/B00H8KVDHE)

The slipring gear is a 1mm pitch, 54-tooth gear. The grommets and washers allow for use of M3 screws without nuts. The gear for the stepper motor is a 1mm pitch, 15-tooth gear. Depending on print accuracy, you may require a M3 screw to keep it in place. Mine fit snugly over the stepper motor's output shaft with a small amount of force. The bracket also takes two M3 screws to mount to the stepper motor.

The holes for the slip ring don't line up perfectly, but you can *convince* the grommets to go through with only a little effort.

I didn't think about the difficulty of holding the grommets still while inserting the screw, so they'll have to be gripped with a pair of pliers or something simi