Just bought a DF500 and was pleased to find that the plastic centerline cursor was already dead-on. Unfortunately, the plastic stop latches (or edge stop dogs) that spring out of the face of the tool were slightly off. I replaced one of them with the provided offset latch to solve the problem and it did improve it to within about 0.01 inches or 0.25 mm but I can still see and feel a slight offset or misalignment on the edge of my 2 joined boards. My question is, can I do anything to get it dead on accurate or is this a margin of error I should plan to live with?