Sorry, I do not remember what I did wrong. However I am guessing that I misaligned something and the glue dried faster than I expected so I could not make adjustments. Recently, I have buying all of my Estes stuff from AC Supply. They offer 40% off (or more) on all Estes products and they have free shipping on orders over $100. Add to that they ship quickly and they have very responsive customer service. I see no reason not to give them my future business. Locally, I buy from Hub Hobby in Richfield, MN. They have a great selection of Estes products in stock and they occasionally have some good deals. The Hobby Lobby closest to me does not have a good selection of Estes products.