I have built a few rockets that have very tight motor mounts. I read on here before that some recommended putting a motor which is unfired(fatter) into the rocket while the mount is drying so that it will not shrink. My gauchito, redstone, and eagle are all very tight. The eagle is totally unusable can't even get the motor in. The red stone isn't so bad,, although every time I get the motor in I think I'm going to squash the rocket into oblivion.. The gauchito lets the motor in about 3/4 of the way which seems ok, it still flies just fine. Just wondering because I may build another eagle and try this techniqure.