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These are the instructions I used from Aurther. Hitch works great and cost me $50 to have it made at a local fabricator.
I finally got my bike back, and a free weekend to put my hitch on.
What you'll need.
1.... 8' piece 1/4" x 2" steel
1.... 12" x 3" x 3/16" steel
1.... trailer ball
3/4" unibit
Grinder
Metal bladed jigsaw
3/16" & 1/4" drill bit
Paint, I used 500 degree black because it's close to the pipe and I had it left over.
Arc welder or other welder if you are not old school.
Add 4 grade 8 2" x 1/4" bolts, lock nuts, a dozen washers, ball for your trailer, wiring harness, and five quick disconnects for your wiring.
I started with the 8' bar bent on a 14" radius. then cut both ends to to the length I wanted. It's hard to figure the exact distance from the ball to the tire at this point so I eye-balled it. I drilled the four holes to attach the hitch to the swing arm, starting on the flat side.
...Depending on your pipe you will have to remove it. Also place the bolt holes so you can get them in and out with the pipe still on. One of mine, the front one, has to be put in from the inside because the speed star pipe is too close. ...
The belt side has to be bent to the curve of the swing arm. A C-clamp will do that, no problem.
Tack your 3/16 plate on the bar stock while it's still attached the the bike. After it cools remove it and weld as you like. I then welded a support brace on the bottom just to be sure the 3/16 plate wouldn't fail.
Cut and grind the extra plate off or just leave it with square corners. Re-fit and cut more length off the ends because I changed the original bolt locations.
I then put it back on. marked my 3/4" hole for the ball. You can center it on the tire with a T-square or just by eye.
Drill two holes for the trailer chains and paint.
I ran the wiring down past the rear brake reservoir and along the hitch. I have it so I can disconnect the wiring from under the seat so when not towing everything is gone and it's just like it was before.
... I had to add some washers as spacers on the pipe side to clear the axle. 2 in the front, 3 in the back. I didn't want it to be vibrating against it. ...
Update:
My dad wanted to be able to stand on the hitch. He weighs 180#. Well the 1" wasn't enough although it survived my thrashing. I switched from 1" to 2" flat stock for the main 'U' shape. He stood on it no problem.
He is towing about 320# right now with his Warrior and is somewhere in Nevada or Arizona (left Seattle on the 9th {7days ago}). Having a great time. Hitch still working great.