I didin't have to add any lead with the Moki, but I was initially dissapointed in the 12lb-1oz weight[]......until I flew it.... After doing my first ever waterfalls and harriers I haven't thought of the weight again. Heck, last Sunday I flew it backwards in a harrier. It is so overpowered with the Moki, that I'm having troubles regulating the throttle in a harrier. One ratchet click up and it flies out.......

Richard