Don't have a single stage to try it on, but would the part taken off a correct vintage single stage and laid on(under?) a piece of graph paper on the copy machine yield an accurate enough drawing to make a part from?
Just old guy ramblings.......
Can't be any worse than what the military did back in the old days, the archived blueprints for the military helicopters that came out of Boeing Vertol in Philadelphia were un-dimensioned mylars. That way the Russians couldn't steal the info.
When they had to make a replacement part to keep a helicopter flying they pulled out the drawings and scaled with rulers the drawing to generate dimensions.
Made the part.
Hoped it fit. If not, juggle the dimensions made a new part. Hoped it fit. Repeat until the part fit. Destroy the dimensions.
The Russians my steal the information.
Glad I'm retired, still makes my head hurt with that kind of logic.
We actually sold a crosshair device that mounted on the CMM's we sold so they could lay the print on the granite plate of the CMM and use the machine to measure the dimensions on the print.
Way more accurate that a tape measure and rulers.