Gyro and Gunthert, many thanks,
1/ No vibration of abuse, equipment stored on the floor for decades.
2/ Scales are flat, nothing touches the needles and the relay contact is at full scale, sticks happen about 75% of deflection
3/ Indeed the meter scale of righthand V meter has flaking paint but the left meter I scale is perfect and the left meter is sticking.
4/ I will remove them from the PSU, open, remove scale, shake while face down, then use compressed air on the movement.
By the way the old API meter relays are very good for industrial controls in the epoch before digital.
The contact is just for dry sig 10 mA max so we use a thyratron to crowbar the main supply with a mercury wetted relay.
Will update after
Bon Journee,
Jon