BOM for upgrade

* Servo: https://www.ebay.com/itm/334109424340
* Spindle: https://www.ebay.com/itm/254532653736
* Belts: https://www.amazon.com/gp/product/B085WS7V7B
* Pulley (spindle): https://www.amazon.com/gp/product/B08VDVN4NL
* Pulley (motor): https://www.amazon.com/gp/product/B08VDLT3Z3
* Drawbar screw: https://www.amazon.com/gp/product/B087MD3ZBQ
* M12 belleville washers
* M12 flange nut - welded to the end of the screw.
* Misc M5 socket head screws.
* M10x100mm screws to mount it to the z axis.