Works but not square to threads - Choate Tool Remington 870/1100/1187/VersaMax Extension

This is my second one of these tubes. Both this brand. One on an LT20 20ga Remington 1100. This one on an older 12ga Remington 1100. They both attach and work well. No hangups, load well, run well. That said, as you tighten the tube and nut you can watch the end "wobble" around (what a machinist might call runout if it were rod stock in the lathe). You have to tighten enough to secure foregrip, while stopping at a point when clamping the tube to the barrel will have minimal stress on the barrel. I found this to be the point where the end of the tube is closest to the barrel and centered right to left, me and my guns anyway. I will also say that I prefer the aftermarket anodized aluminum followers over the provided orange plastic follower.