prrjim posted:I am surprised you can tighten the screws through the boxes so tight to warp them without stripping out the threads in the carbody!
By ever so slightly reaming the center hole in the metal Kadee gear box, a 2-56 machine screw will fit through that hole. Drilling the proper hole in the under frame, and then taping to 2-56, one can tighten that screw pretty darn tight, which warps the plastic cover & gear box assembly.