Need help in a few areas. I Just stepped up to a world models 300s, looks great, test fitted the wings and one wing won't go together. Won't work with wing tube , dowel pin and threaded bolt.... pull out wing tube and it goes together. Also what size servos and what size battery, I'm not getting into digital servos at this time and I'm going to use a moki 2.10. Thanks in advance for any help.