Soundcraft Saturn 624 tape tension arm assembly with Kinetrol continous damper P228 sensor

These are really expensive damper sensors by Kinetrol who are world leaders in this type of unit, I understand now why these machines were expensive and how the Saturn's were famous for having very very good and fast tape transport as they had huge motors and great sensors, really well designed

I have a left and right arm ( price for one) the sensor  is the same on both but the arms are different, these are HUGE money new