Quote:
Originally Posted by Peter Ward
The pressure tuning system is not complicated. Air density is used to change the refractive index of the etalon chamber.
I suspect all that is needed is you completely screw off the tuning knob/chamber. Replace the O-ring and apply a smidge of silicone grease on the new ring. Re-install the knob. Should work like new.
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It’s what we did at Bintel Melbourne back in the day. I remember doing one or two. Thought I should add if you are not comfortable then see Stefan