1203bb dc motor speed controller simple case

Summarygot a 1203bb dc motor speed controller to play with an see if i would be able to make a powerfeed for my mini milling machine. i have a few different ideas incase the others dont work out but which ever i can make feed my y axis the best, i'll probably end up sharing them all just incase someone isn't able to source something that i used, but cheapest way im seeing to do it is by using a power wheels gearbox and motor, cost less than 20bux for both an the 1203bb speed controller, i got mine for 6 so should be able to do it with those parts for under 30bux and a few printed parts. im going to try to make something that can be engaged an disengaged so it will be alittle more than that but in its simplest form it could be done with less than $30. the other options use a window motor out of a vehicle, what i have on hand now was parts we've pulled from old cars an saved so i have nothing in them but they are out of mid 90s to early 2000s gm cars like cavilers or grandam