Hello. This is my first RC Tank. I bought a Heng Long Panzer III and would like to replace the tracks and wheels with metal ones. I am having difficulties removing the RETURN ROLLERS. It seems that the axle is a pin that is place really tight (as opposed to a screw which is the case with the idler, sprocket, and wheels). I could pry it but thought maybe there is another way. Any help appreciated. PS. This is really an accuarte representation of the "L" model, which I intend to accuraze and paint up! Great hobby!!! - Harvey