Donny I save this from either here or the other broad don't remember who the author was but it sounded like a good fix.
but I have never tried it
From other posts and talking to other Cub owners at various shows I know that the steering arm becoming loose on the early Cubs is a problem. The coarse thread bolts are not available.
I solved my problem by removing the arm and spindle from the tractor. I mounted the spindle in a vise, installed the steering arm and drilled a 7/16th hole completely through the arm and spindle. I removed the arm and installed a 7/16 - 14 helicoil in the back side of the arm. I then took a hack-saw and cut a slot in the back of the arm (90o from the drilled hole). After installing the spindle in the tractor I used a 2 1/2 inch long bolt with nut run up to head to secure the arm. It still looks like the original setup.
Hope this helps others. It was cheaper than buying late model spindles