Sweat Soldering is the optimum way to bond the board and the metal clad. Just solder paste is required. Going with adhesive will increase the cost of fabrication and also the cure temperature requirement for the adhesive will make the fabrication more complex.

Understanding the Context

Thank you all. So, the clock offset won't meaningfully affect your receiver. So, I wouldn't sweat it; if you can get a 26.041 MHz oscillator, that's going to be more than good enough. However, there's also an easy way out here that only needs a much easier to get multiple: generate 40.0 kHz, 60.0 kHz, and a (77.5 - 40.0) kHz = 37.5 kHz Normally where people get burned is that their boards get put in a "condensing" environment even though everything is specified as "non-condensing".

Key Insights

But that's not a design problem so much as a specifications issue. tl;dr Don't sweat it and just do your design. Good luck. But if these are just test points (which I agree I think they are) and you don't know where they lead to, then you couldn't get any use out of them anyway... so I wouldn't sweat it.

Final Thoughts

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