Z- and X-axis power feed using windshield wiper motors (PM-30MV)

Note: I've uploaded a follow-on video to this one, at • A complete guide to us... . It shows the wiring detail, whereas THIS video focuses on the mechanical detail. I encourage you to watch BOTH to get a complete picture of my setup.
Decades ago, I had rotator-cuff surgery of my right shoulder, due to lots of racket-sports misuse. It wasn't very successful, and so I don't have much overhead strength/endurance on that side. :-(
In my first day of owning my PM-30MV mill, it was clear that I wouldn't be able to manage using the Z-axis crank for more than a few seconds. So in the second day of ownership, I created a very simple Z-axis power feed using a cheap Jeep windshield wiper motor.
With that success under my belt, the following week, I created an X-axis power feed using another copy of the same motor. I think that my X-axis feed is somewhat unique in that it preserves full use of the X-axis manual crank.
The only modification to the mill itself is three inconspicuous drilled and tapped holes for the mounting, and a deeper recess in the crank handle. So the mill could be restored to "normal" very easily.
Unfortunately, I did all this before I even considered starting a TH-cam channel, so I have no videos of making the parts (mostly on the mill; just a little on the lathe). So retroactively, I've disassembled the X-axis mechanism to show its design and construction. (The Z-axis feed is too simple to even require a disassembly.)
The major parts list is provided below. You'll also need the aluminum and steel stock, some hardware, and some wiring.
The chapters are timestamped so you can skip ahead to what interests you.
00:00 - Introduction
00:55 - Simple Z-axis power feed
04:14 - Quick view of the motor controllers
05:05 - X-axis power feed overview
07:15 - Modifying motor to delete common chassis ground
09:04 - How I prototyped/built the X-axis feed on the mill
09:42 - X-axis power feed in operation
10:41 - Minor machining of original X-axis crank handle hub
11:23 - Showing X- and Z-axis limit switches
13:05 - Simple clamps for X-axis clutch in/out slide limits
13:38 - X-axis belt and tensioner detail
14:30 - X-axis motor drive using 15mm socket
16:15 - X-axis slave pulley detail
17:08 - X-axis drive disassembly on workbench
21:13 - X-axis belt idler detail
21:57 - Start of re-assembly of X-axis drive assembly
25:02 - Reattaching X-axis drive assembly to mill
26:42 - Reinstalling the X-axis drive belt
27:34 - Reinstalling the X-axis motor (out of frame)
28:15 - Reinstalling the X-axis manual crank
29:00 - Testing the X-axis power feed after reassembly
29:08 - Internal detail of the X-axis limit switch assembly
30:58 - Wrapping up with detail of controller connections
Electrical:
Jeep Wrangler wiper motor: www.amazon.com/gp/product/B00...
0-48VDC 480W power supply: www.amazon.com/gp/product/B07...
Aluminum project box: www.amazon.com/gp/product/B07...
PWM motor speed controller: www.ebay.com/itm/385108148663 (includes rocker switch, potentiometer+knob, LED readout)
Push button switches www.amazon.com/gp/product/B07...
Microswitches: www.amazon.com/gp/product/B08...
Mechanical:
1/2 inch drill rod: www.amazon.com/dp/B00R11KFTW
1/2 inch bronze bearing: www.amazon.com/gp/product/B00...
60T GT2 pulleys: www.amazon.com/gp/product/B08...
400-2GT-6 timing belt: www.amazon.com/dp/B014U7OSVA
Idler pulley with bearing: www.amazon.com/dp/B07JMRR7CC
15mm shallow socket: www.amazon.com/dp/B0885KK1B9