Orbot Counter Balance

[encaprodney]

You are on the right track with removing that counter weight assembly. You may need to heat up that center screw that you hold in place with the allen wrench because it may have lock tight on it that prevents the screw from backing out under the extreme vibration. Just apply some heat from a propane torch on it for about 30 seconds, then hold that screw in place with your wrench while you turn the plate counter clockwise. You can turn that plate by either wedging a prybar between the weight plates or by using a large pair of vise grips to grab and hold the counterweight.