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Hi Peter,
I'm afraid I can't help you with the oring replacement, but am interested in the reason you are replacing them.
I also have a 60mm pressure tuned Lunt, and for the last few months have not been able to see any detail, either surface, or prominences.
I know the sun is super quiet, but I see images on this forum showing prominences which I think should be visual, but nothing seen.
When I start to observe, I always unscrew the tuner to equalise pressure, then as I turn it in, the tuner gradually becomes firmer to turn. I take this as an indication that the inside pressure is increasing. But there is no change to the detail through the eyepiece.
cheers Phil
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