Beautiful balance. Electrical problems for quick check: 1.) Measure resistance of the coil - but beware, wires are hardly to see. Two same windings with the center tap. Resistance few hundred ohms. 1.a) Coil goes to the small 4pin connector on pcb. Center tap is pin 2 from the left -> on +23V. pin 1 21-22V, pin 3 19-19.5V 1.b) Bigger 8-pin connector ST3 voltages from left: +0.48, +3.7, weight dependent, +9.8, gnd, +13.8, gnd, +13.8 2.) There is a two pin open connector on the small pcb attached to the cell. Measure voltage between. You must have symmetrical +- voltages when you move lever up/down (+2V up / -2V down. One pin of this connector must be on the constant +7V to the ground 3.) Other problems - FETS driving the coil....and so on...