Took me awhile to find these pics, but here's a 5/8 bolt & a buncha washers,
with the shaft collar & freewheel flange tightly bolted against each other:







The bolt head is secured in the vice, while the
shaft collar & freewheel flange are welded together:







And VOILA! Poor boy's freewheel adaptor:







Fits 5/8 axle:






*** The **** Is My Shepherd! ***

(Geezer & Bent Enthusiast At Large)