How much “slack” is there in the pre-made settings? They mostly
seem to come in whole mm sizes (3 mm, 4 mm, etc) but sometimes
stones I see are “odd” sizes, 3.5mm or 3.15mm.
Some I’d like to get are sized 3.75 mm. This particular dealer
notes plus or minus .3 mm per stone for this particular batch, plus
or minus .2 mm on others.
So if I got 4 mm snap-set premade settings, would I just have to
tighten by hand for some stones? Or do “off” size stones just have
to be set into custom made settings?