Yeah, goodonya mate, thanks for the thoughts. The Crane is an exercise in learning, thinking and practising engineering skills and won't be used to lift heavy weights. The use of different weight loads is only to learn how to control the balance. I have already done the calculations regarding the distance from the fulcrum and the increase in weight per mm over the length of the long boom. I know what counterweight I need to keep it in balance. However, both of your suggestions are good ones and will be well considered.