There is a picture and trigger set up on:-
www.pilkguns.com go the "Coaching and info" and then the "10P files" and then "FAS".

The FAS company still exists www.dominoguns.it they don't make the 606 but do make the 604 in small batches occassionaly, they have service detail on pdf's and I think internally the 606 is very similar.
But Bob's the man on FAS's
Good shooting,
Robin