I'm slowly putting together my 450XL HDE. I got the head onto the frame today along with the main gear. (with Finless' video's help) After tightening things down, I noticed the main tail gear underneath the main gear is deformed. The gear is not uniform where the whole gear is in the same plane. I can see it "move" up and down where it contacts the tail drive gear assembly. I think it's caused by the screw at the bottom of the gear holding the main shaft. What can I do the resolve this? The only way to keep it somewhat uniform is to loosen the bottom screw until the shape returns. But I'm afraid it will work itself loose easily that way. Have you guys had this problem before? How do you resolve it?