Hello, As part of my BG4000 restoration, I am looking at the tonearm tracking adjustment. On page 4-6 of the service manual, it states the following: The first part to adjust the forward direction is clear. However, point 6 makes no sense for backward adjustment - what is meant by 10cm? Certainly not the arm. Even 10mm would be a massive amount. I am wondering if they mean 10 turns backwards? In the service note, issue no. BG1, they state that adjustment of servo sensitivity is for 15-19 record groves. This is different from the sensitivity of 4-6 grooves of the main manual in the forward direction, and does not really relate to the 10cm mentioned for backward adjustment. My second question relates to the same service note BG1, see below: The addition of the preset pot as shown makes no sense as shown. To match the circuit on the left, it seems to me the track shown by my red arrow would need to be cut. Any advice gratefully received.