Reciprocating rectilinear motion actuator remixed

I'm creating a fine control PCB drill press but want to automate the up-down of the actual drill component. Found this and modified original for my needs as follows:
- changed gear inside diameter to 4mm and added a place for a square nut to brace the gear and keep it from spinning instead of the original design
- modified the motor mount to allow for my geared motor to fit and also thinned out the plate to allow more of the pin to stick through. Also recessed the screw holes to reduce inter