Done all that I know to do:
-installed new spring;
-decreased tension on old armature spring;
-straightened switch leafs and adjusted for minimal tension;
-switched armature with no wear from a non-hold relay;
-measured resistance of coil, 22.3 ohms
(Pinrepair gives a 9740 coil 24 ohms);
-all 9740 coils measured 22+/-;
-set transformer back to normal tap.
Are 2 ohms less resistence enough to be the cause?
Going to find a 9740 coil from another game that meets the 24 ohm resistence and see if that changes anything.
Anything I missed? Thanks.