I'm still testing this to see if it will break. Thank you to Cohens Customs for reaching out to me and letting me know this was an option for me and my attempt at the ERCF on a non Voron printer.
Here are my settings in mmu_macro_vars.cfg that's a little different.
variable_pin_loc_xy : 220, 150 ; x,y
variable_pin_loc_x_compressed : 237
These are the only two that's different besides the speeds which might vary from machine to machine.
The author remixed this model.
The original arm would sit on the X axis extrusion. It wouldn't line up with the two screws for my tensioner on the X axis. I wanted to move it over a little more to have more clearance. Instead of bugging the original creator more I figured I'd give it a shot. So I added a slot all the way across and then made the rod with a threaded M5 bolt that I had to attach it.