Hi, more measurements. I'm not sure of the precision of my plastic caliper but that's what I have. Thickness comes to 3.7mm
The crown can be screwed to the tap 6 (1.30mm) and tap 8 (1.10mm). It's more snug on tap 6. Tap 7 (1.20) might be best, but I can't try it for it's not on my instrument.
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