I have made replacement guides for the spark plug leads that attach to the rocker covers on Rover V8 engines.
The screw was seized and the original guides did not come off intact!
A few measurements and design changes to suit 3D printing and the results work well.
The guides do need supports to print, mainly because of the large overhang for the counterbore.
I bought new machine screws. That was an exercise in working out historic imperial abstract naming conventions! The screws are 3/16"-24tpi x 5/8" long. That's not what you look for to try to buy them. They are called #10 UNC or #10-24. I will never understand the thinking process of naming something with another number to represent the size, instead of using the size!
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