i've got most of the parts together for a M4 build i'll be doing. all i need is for for gears and motor to be restocked. anyway i have a Bravo matched (whatever that means) gear box to begin the build. it came with 8mm Bearing Bushings. my 1st inclination is to replace them with 8mm bushings and part of me says keep the bearings. so i thought i'd get some opinions from more learned folk than myself. the reason for the new gb is my old one had 7mm bearings, and after 14 months of play 2 of them spun and actually wallowed the holes. so ... keep the bearings or just replace them with bushings and super glue them to the shell?