I am building a shock damper for various weights which will be added at Mass D below. What I need to calculate is by how much would I need to turn my adjusters thus changing the angle of the spring, which in this case is 14.9 Kg rated, to allow for different weights to remain at a level attitude, and the operating arms to remain horizontal. The attachment should explain better perhaps! This actually allows a 2.5Kg Mass to remain level with a 14.9 Kg rated spring. If I add weight to mass D, then the upper and lower arms take on a parallelogram shape and the mass lowers. I then need to screw my adjusters up or down to then bring the new mass to a level point where the parallelogram is once again a rectangle. Does anyone know of any calculations that might be of assistance here please?