Blizzard's rolling rebuild of a 1303 1975

[Blizzard]

The hard part was the depth of both holes. Especialy from the back. If you drill to far the cable would hit the bottom of the hole instead of bending and going into the axle bore.

The trick to make sure the holes line up perfectly is to drill a very small pilot hole from the back. I first drilled a 2mm. hole and checked if it was meeting in the middle of the axle bore. It was of by 1mm vertically. I adjusted the clamp of the drill press and drilled the final diameter pass very slowly so it would not follow the pilot hole and take more material away from one side. This only works if the pilot hole has a very small diameter. If the pilot hole is to wide the final drill bit wants to center in the pilot hole and will bend and most likely brake.

If you are off horizontally and the pilot hole would meet low in the axle it would be an easy fix and drill deeper into the axle. If the hole from the back meets up high you would drill deeper from the back.

So the lineup left to right is the most important to get right.

It also took 3 drillbits to do the job. It is very hard steel, take it slow and use cutting oil. If it gets to hot take a brake to let it cool down. Otherwise it could take a whole lot more drill bits.