I hate to admit this, but I actually messed up using the Estes Fin Alignment Guide. How so you ask? Well, I've used it like three times now -- last night was the third time, while working on a repair of my ARC 1318 PSR. Every time I use the fin guide, my freaking fins stick to the plastic pieces that slide into the grooves on the base of the alignment guide that are designed to hold the fins straight while the glue dries. And every time, I ruin a set of fins and have to start over again -- and I end up just doing the alignment by hand. After last nights debaucle, I'm sleeping, and I wake up and I realize I dont need to have the plastic pieces right up against the tubing for the guide to work. And wallah, I have solved one of lifes great mysteries. DOH!