Want to ask here for a schema: http://www.pbresource.com/mansch.html#manaval ?
You have THREE relays sitting next to each other sitting near the Score-Reels --- http://www.ipdb.org/showpic.pl?id=363&picno=27288 --- probably the 1 point / 10 point / 100 point Relays (the 1000-point Score reel is actuated by "pos-9-switch on 100-point Score-Reel AND the activated 100-point-RELAY). Question: Does ONE of the THREE relays intermittently fires when You have "repetitive chugging" ?
"Switches beeing closed in both states / Switches beeing open in both states": NOT in a "fully original pin***".
(Interlock-Relays later) A simple relay has a Normally-Open-Switch. I can see this by looking at the relay "non-pulling" and "(simulated by hand) pulling": A blade is moved - it moves towards another blade - it would like to get in contact. So I adjust the STATIONARY BLADE*** so the switch is securely open when relay is not pulling (and closed when relay is pulling).
A simple relay has a Normally-Closed-Switch. I can see this by looking at the relay "non-pulling" and "(simulated by hand) pulling": A blade is moved - it moves away from another blade - it would like to get away - loose contact. So I adjust the STATIONARY BLADE*** so the switch is securely closed when relay is not pulling (and open when relay is pulling).
A simple relay has a Make-and-Brake-Switch. I can see this by looking at the relay and count three blades ... I adjust one or both STATIONARY BLADE(S)*** so the switch does what it is supposed to do (a tricky adjustment).
A simple relay usually has not "Make-and-Make" Switches. This is a blade moved and making contact - both blades having contact are moved further so they make contact with/to a third blade --- in the end: ALL three blades have contact (I know this type of switch from Replay-Counters).
STATIONARY BLADE***: The "moved blade" is hooked-in into / onto the "Nylon-Ladder / Nylon-fence, pawling", so we adjust the other blade(s).
Interlock-Relay: We think away the trip-side and look at the rest as a normal, simple relay.
Barry, adjust the switches - write down "on what relay You have adjusted which switchblade(s)".
A general rule - On a "Normally-Open-Switch": At 50% of travel of moved blade: The two blades meet (and travel the other 50% having contact). (((You can do: At 30%, 40%, 50%)))
On a "Normally-Closed-Switch": The first 50% of travel the two blades travel together - having contact - then the moved blade travels alone. (((You can do: At50%, 60%, 70%)))
On a Make-and-Brake-Switch: I am happy when I can adjust it to "functioning" ...
"Precious Self-Cleaning of contacts": Look at the JPG - The "center-point of circular moving" of the two blades are "off-setted" - see the two curved lines ? When a relay does activate / de-activate: contact-points move sideways = Self-Cleaning.