I have a mint Golden Arrow I bought new circa 1989, used maybe a half dozen times then put it up. I now have grandsons and want to start playing around with it again. Bought one locally and a couple of eBay for parts etc so I currently have four in various stages of operability. How do I remove the servo? I took off the bracket but it still seems to be solidly mounted to the frame. The steering does not return to center from a right turn, so I thought might replace. Also how do it open the rear end to apply some lubrication? I have never worked on RC's but I am retired now and thought it might be fun to play around with them.