OK, i just decided to step in the water and ask a question. From what i am seeing i am assuming just by looking at the pictures that the bearing bolts are where the entire assembly is bolted into the machine. Is there a stiffener plate inside to lock all the towers together and if not where is the vertical load transferred to as the spring action occurs? I know you have said this is the prototype, seems like a lot of load on just those 4 bolts attached to the frame unless your frame has a unique design. I am not a engineer but a mechanic by trade. It seems like a lever effect will occur with each spring action. Just curious i may have missed a picture somewhere.
Lewis
Life should not be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways , cigar in one hand, whiskey in the other, body thoroughly used up, totally worn out and screaming "WOO-HOO, what a ride!!!"