Hi zooman
I believe You have two faults - but Your action (Switchstack-1) is a work-around for both.
Lets first look at "You loose a a ball" - (bonus counted down ?) -> The Outhole-Relay pulls (do You see Your Outhole-Relay pulling ?) Score-Motor does run -> ball is kicked out.
With Your action You start the Score-Motor turning -> the rest off the steps can take place.
I assume Your Outhole-Relay is pulling - but a switch mounted on it "faulty" not making contact.
Look in the ipdb.org-schema at E-11/-12, F-11/12 (its just between E and F - between 11 and 12) -> the Score-Motor -> nearby a "Make-and-Brake Switch on Outhole-Relay" - the relay should pull and throw the switch: Current can flow to the Score-Motor -> it starts running.
In Your pin it should - but does not start running -
You activate Switchstack-1 and throw the "Make-and-Brake-Switch-1E on Score-Motor" (see it in the schema at C-10 ?) and through here current can flow to the Score-Motor to start turning.
You solve "Your starting problem" also with activating this switch.
The "written above" is GUESSING - please write how much You push onto Switch-Stack-1. Do you push onto the bakelite plates (did You tighten the holding screws ?) ? Do You push onto the outer end of the top blade ? - do You activate the switch-stack ? (I believe: You cannot activate - the nylon wheel hinders) - What exactly are You doing ?
Can You manually put some credits on the Replay-Counter and start a game by pushing the Replay-Button (and report about the things happen) -
The schema is complicated in "Coin chutes and Coin-Relays and wiring and different settings" - trying to start a game by pushing the Replay-Button is much easyer to look up in the schema.
Greetings Rolf