I've got one of these and I'd be interested to hear how you get on trying to repair your one as I've been advised that they are completely unrepairable due to a design fault and lack of spares, but just in case it's of any use to you here's a link to a copy of the Manual for the rifle which includes an exploded diagram.

http://www.pilkguns.com/wp-content/u...erlimlg450.pdf

Vic Thompson.