Ok guys, heres some more pics to help the Yama owners
here you remove the axle and knock out all 4 studs and then I drilled the holes to be exactally 5/8 big
Then you take spacers like these Which are 5/8 OD but only 10 MM ID
Then you put them in the axletube, and in my case I used wheel spacers so I drilled the holes on the spacer to 5/8 as well so the spacers centered the wheel spacer
Also you leave the spacers out exactally 1/4 behine the axle, This gives the Disc a flat surface to mate up to. And clean the backside if the axle and the spacers and weld the spacers to the axle on the backside so your spacers can not move.
before reinstalling the axle you will have to drill out the threads at which hold the axle in and weld nuts on the inside so you can bolt it from the inside out. Because now with the disc in place you can not bolt up from where the drums used to be because of the disc being in the way.
And heres a shot of the Disc, as you can see its threaded for a 10mm 1.25 pitch thread, so you slip the disc up behind the axle and use 4 bolts to put it all back together then slide your axle back in and bolt together.
Brian