[Collins] 51S-1 "S-meter" sticking at extreme right hand side of meter during receiver mute

[Dave, K2DP]

Gentlemen:

My 51S-1 (mid-1960's winged emblem) has developed a minor problem. The S-meter now sticks in the extreme right end edge of the meter each time I mute the receiver to put the KWM-2 into transmit. A simple tap on the meter glass will return the meter back to the left hand edge when I put the KWM-2 back into the receive mode. Is there any way to limit the right hand deflection of the 51S-1 meter when putting the receiver into mute ???????

Many thanks for your help,
73,
Dave, K2DP, St. Louis