shimming hydraulic roller lifters solid

Do you by chance have any pictures from this ?
No. it was so long ago and not my engine. I know the tube stock was just over 1 inch outside diameter. Then turned down to press fit size and drilled inside to thin it out. Then a hole was drilled into the side to align with the lifters oil fill port.

We did 90% of the work on a small Chinese Harborfreight pin lathe. He used RED lock-tight when pressing the tubes in the lifters. .

The small grove cut in the outter body if the lifter was just a small scratch like line and on the non-thrust side of the lifter. It was only enough to add a little more oil to the roller wheels and cam lobes. Maybe 0.005 inch deep. It was done with the lifter locked in the lathe and a thin Carbide cutter just dragged down the side like a broche.