Here you go Jack and S.B.
First the factory delivered spacing of CZs on a section of MTH O72 Real Track.
The same factory delivered spacing on a section of Gargraves stainless flexed to O240 (10'ft radius as carefully measured by Mr. Hikel).
Finally the setting closed by two notches (holes) on the same section of O240
Someone wanting to run point to point on absolutely straight track could tighten the couplers so the diaphragms are completely intact and no light would pass between them.
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