Hi Mate,
Andrew(Beaky) has fixed a few of these Indy Jones mini playfields. In actual fact, he studied that one (yours now) when he was diagnosing a similar problem another one had.
If it was working fine to start with, it shld only be an adjustment. I will send u his email details etc. Maybe I could get him to call you.
In the meantime, if anyone else has an answer they will jump in.
Reverse what the bloke told u to do from the other site. Because it was working fine the way it was originally, put it back that way first IMO.