If the first picture with no clearance was the objective to shoot for, with the possible variation in tile setting, there would not be both plus and minus wiggle room so if one were to strive for no gap and came up shy by 1/16" it would rub. Also, the tighter the clearance, the more visible the variation, so if one were to strive for a 1/4" gap and missed it by 1/16", one at 3/16" and the other at 5/16" would IMHO still be acceptable.





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