Step 4: Weight
I cut the belt and attached the metal plates to it, estimated the height of the weight from the bottom to the upper fastening holes and subtracted that amount from the distance between the axle and the base. Then I subtracted a few centimeters (just to be safe) to get the distance between the weight fastening holes and the axle.
You absolutely DO NOT want to MELT LEAD! http://en.wikipedia.org/wiki/Lead#Health_effects