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case tube and crown sizing


canthus

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Can anyone explain what the 'tube diam' is based on when sourcing a crown.  For example (crown dia 3.50) x (tube dia 1.60) x (tap 0.9 dia).

I understand the crown and tap diameters but I am confused as to what the tube diam actually means.  Is it the o/d of the tube (the bit outside the case body, not the part fixed in the case body) which is commonly shown as 1.3, 1.6, 2.0 etc??  How do I find the i/d in which the stem fits, especially if the stem has a tube with/without an o-ring seal?  Will a larger tube o/d mean a larger crown tube dia ? Any advice info will be much appreciated.

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