What size tube are you using ? If it is small and the wire is just hard to push through you will eventually be able to do it once the kinks have relaxed in the wire. If the tube is big enough the wire is folding back on it self inside the tube it may just be easier to install a new tube. If the fuselage is long enough to hold the whole antenna without an exit I install the antenna into the tube first and then slide the whole thing into the plane. I only attach the tube on the end I can get to and I make it easy to break out. If the formers line up right I just bow the tube between two of them and let the spring tension hold it in place.