I wish to find the Centre of Gravity of a sub chassis in order that I can arrange the suspension points equidistant from this point. The sub chassis is effectively a long isosceles triangle with the arm at the acute angle end and the platter bearing toward the opposite side to this. The arm and bearing are located on a line through the middle of the triangle therefore the chassis is balanced either side of this axis. Therefore I only have to find the balance point on this centre line. I can find the C of G of the chassis easily by experimentation but obviously do not want to do this with the arm and platter fitted. I know the weight of the arm and bearing/platter assembly and where they will mount on the sub chassis. I could do a simple lever arm calculation to determine the C of G between these but this does not take the sub chassis C of G into account. Is there an easy way to calculate the overall C of G of the sub chassis/arm/platter assembly?