@Bill How confident are you that it will print with a BMG clone? I was looking at this one: https://www.amazon.ca/iMetrx-Extruder-Upgraded-Creality-Anycubic/dp/B09LXJT6D1/ref=sr_1_5?crid=2W5AINPL8DDNQ&keywords=bmg%2Bextruder&qid=1652833998&sprefix=%2Caps%2C56&sr=8-5&th=1 Because I have to be honest, I don't like the idea of throwing more money at it, especially when there's a restocking fee if it ends up not working.

@Bill I tried to e-mail you at the above address but got the weirdest message. It was returned undelivered to what looks like your hotmail address. It's not clear if it went through to the 3dchameleon address. Did you get it?

There is a screw missing, I dropped it during one of the several times I changed that part around and it magically vanished. I don't have an extra one on hand and haven't had a chance to track down a replacement yet. 3 of the 4 are in and there's no wiggle on the stepper. Underneath the red part is a metal bracket with screw holes. The stepper and red piece are aligned, the gap is all perspective and camera flash. The motor is centered in the opening. That being said, the red piece itself is community made so maybe something is off with it. But it's also the only thing solving this problem: https://www.3dchameleon.com/forum/support/ender-3-pro-extruder-jam

You were correct, it wasn't quite activating the switch. I've adjusted that and have a new problem. The Chameleon doesn't push the filament hard enough to overcome the tension in the extruder. There's no way to adjust the spring tension, which on one hand seems like a poor design decision from Creality, but on the other hand in the 3 years I've had the printer I've never had a tension problem when it's being used as designed. In any event, it's what I have so it's what we need to get working. I tried using some super thin support scraps at the X to shim it and push the spring lever in to ease the tension, but couldn't get it in the goldilocks zone. It either pushed the filament in but then the extruder didn't grip it tight enough, or didn't go in at all. If you have any suggestions I'm all ears, otherwise I guess I'll try to modify that part to give less tension when I have some time on the weekend. Still don't know why it wants to pause but I'm not ready to cross that bridge yet. We'll figure that out once the mechanical operation is working.

It looks like that might just work. Tested it a few times with no jams. I'll follow up one more time once I finish getting it going. For anyone that has the same problem, a quick warning: a lot of people in the comments of that remix found the hole for the connector to be a little too small. I did as well, but was able to force thread it with some elbow grease.

The E3 Pro doesn't have a way to adjust tension, the only way I could adjust it would be to start swapping out springs. But since I don't have a collection of springs handy that's not an option. That link looks like it might solve it though. In the remixes there's a fully printed version. I don't have a lot of extra PTFE tube lying around so I'll try the remix first. https://www.thingiverse.com/thing:3844646