He states multiple sizes at 2:08; 27mm Allen head or 1 and 1/16” nut.What is the size of the hex? Should be able to just get a bolt with a head the right size and use 2 nuts on it locked together to make a wrench. Or if you weld just weld yourself up a tool that fits using the bolt as the driver.
Later (6:30) he states a 19mm hex is what he is using - (not sure why my previous post doesn’t show the video anymore - link: youtu.be/8X9xpioehv4)
He welded a special tool out of a socket and ratchet wrench, looks like it would work well since it looks tight
Going to try this myself as my 2014 has wandered all over since I got it. Alignments out the back door to no avail; nobody in my area is Raptor savvy - or F150 to boot I guess since it’s nearly the same vehicle.
Hope this solves it. Let us know if you have done this.