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Any way to tell if these are RCPS or Lunsford?
The four on the left are 0.1255" in diameter.
The six on the right 0.1235" in diameter.

CalPolyME wrote: ↑Sun Jun 22, 2025 7:20 pm Any way to tell if these are RCPS or Lunsford?

Technically all ten are Lunsford... RCPS's titanium parts were just rebranded Lunsford products.

.0020 in. is within manufacturing tolerances for a 4-40 screw.

the nuts on lunsford turnbuckles I believe are stainless steel but those look different between the sets (other than being more chewed up). you can check to see if they are magnetic.

but ultimately, RCPS and Lunsford with this construction are the same.