I have an older makita 12" planer 315mm model #KP310. It has preformed beautifully for over a decade but now the front bed that dials in and out is out of parallel with the rear fixed bed about 1/8". It tips forward. I have taken the machine apart and the pistons both seat very snugly and slide in and out easily. Does any one have experience tuning these planers up. The newer makita usa planers ride up and down on a dovetailed key so they must have addressed this problem.