I finally got to madien my trainer, well I didnt madien it but I was still very pleased, sun. was a learning experence for me, learned that I needed airspeed and to flare or I'll break my prop ( its was my first landing ) but still in one piece, I was told before we madiened it, that I needed longer screws and to use a nut, right now it just 4 40s treaded into the mount, What is longer than a 4 40 but same diameter, or will it be ok not to use a nut? I can get pics if needed