Son has walther Co2 pistol i replaced new trigger cannot put it back together again sounds like humpty dumpty thats me, any pictures etc bloodly would help and for a plastic trigger £15 for this.
Welcome to the BBS
Exploded diagram at Chambers here;
http://www.gunspares.co.uk/showcatimage.asp?id=24517
Same website for your part;
Trigger - part no TR148 £12.79
http://www.gunspares.co.uk/
Excellent service from Chambers.