The mini servos are light and work great for throttles. Also, the Dubro Feather Lite tires save a *lot* of weight. If you have excess axle material sticking out, cut as much as you can off with a cutoff wheel. You would be surprised just how much weight that is when you put the removed pieces in your palm. Foam wheels for small electrics work great for tail wheels instead of the heavy rubber/plastic ones.