project – fix telescope; missing M5x0.8 custom thumbscrew/bolt, maybe 3D print? maybe bash one out of a larger bolt?

so my telescope (Celestron NexStar 130 SLT) is missing one of the 4 spider adjustment (aka secondary mirror adjustment boltts).

nothing found in Mcmaster-carr. Asked telescope mfg for part# & cost.

a bit more sketching, and finding possible bolts, and possible cobalt drills:

or maybe make a 3D model and have a 3D printer fab one up (JLCPCB?)