Sorry for late response, the ones I have are also 18mm. It doesn’t bother me that they bottom out early, the shaft is strong enough to support the weight of 10 gauge wire easily and because their straight barrels they have full contact all the way around. I dislike the kind with the spring loaded centers, they seem to only make contact in the middle which can make for a sloppy fit.
Okay, it’s right over the plate, swing away Lee. Here batter, batter, lol.