Quote:
Originally Posted by Alk8944
Afraid I can't tell you what the thread in the sling bar is either even after checking mine because I was curious. It appears to be a proprietary thread as it doesn't match either anything either SAE or Metric. The bolt in mine measures .286" x ca. 30 TPI. It is between 28 and 32 TPI, my thread gauge is pretty standard. I expected it to be 1/4 x 28 TPI, but it isn't even close. My rifle is ca. 1959, no reason they would have used a metric thread at that time!
Sorry I couldn't help, thought this would be easy!
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I went down that road as well. I got anywhere between 27 and 32 TPI. I can't tell for sure with a thread chaser. I measured a major diameter of 0.285".
This is why it is not a simple case to just find the right swivel stud.
I could possibly fabricate an aluminum plate that will accept two of the Model 75's rail screws, with a drilled and tapped hole between them for a standard swivel stud. My facilities for fabrication are somewhat limited. No drill press, for example. So it could be a rough go.