Yes. I have. Also, I believe Dave Stinson has. I will have to dig out my notes on it since I have not done it in awhile.

And, yes, the process slows down as it proceeds.

I purposely bought quite a few crystals in the high 6 Mhz range for this purpose.

What I wanted was a series of 40 meter crystals 5 kHz apart covering the CW section of the band, then later, planned to split the difference with another series.

I never did find enough high-3 Mhz crystals to attempt the same thing for 80.

So far, life has gotten in the way of that project, of course.

I started it and made two crystals for 40, then had to set it aside.

I'll find my notes and will report here as soon as I can.

Ken W7EKB