Gerbutt

Hiya I think this is my first post - pity it's to do with something that's been a right old pain in the bot bot!!......Had my first day of 39 trainig today, the chap who runs it won't provide top handle saws - he doesnt like them - so I had to borrow the chaps who I've just stared working for saw. All was going well and then when another student was using it the trigger started sticking. the bloke who was doing the training said the spring must have come off on the trigger on the top of the handle because it wasn't springing back. he took the side of the handle off and it was the spring so it was put back on and all was good. Then the spade end thing on the wire that goes to the springy cut off switch thing snapped so that was the end of the saw for the day. Spent more time trying to mend it than we did up trees. Got a new spade end on the way home and fitted that so thought all was good again but now I've put it back together when you squeeze in both triggers and put the choke onto full they wont in lock in?????? I've had it to bits loads this evening, downloaded the exploded diagram and I can't for the life of me work out whats wrong!! there doesn't seem to be any bits missing from within the handle! Please if anyones got any ideas could you let me know? What a mad day hey!!!