Just orded via phone more parts for my Quest and my Legacy, and again Crosman customer support did not disappoint. A new spring and seal for my Legacy is all of $7.00... hopefully, that'll bring the velocity up to snuff.
Also called Daisy to see about getting a spare piston seal for my Powerline 1000 - no dice. They don't want anyone losing fingers while disassembling the gun - and no, they won't just let ME worry about it. They ARE allegedly sending me a diagram of the parts they DO sell, but the diagram isn't available online.
It's a shame - I know the Powerline has a lot of detractors, and it IS a harsh and crude gun that seems almost toy-like in some respects... but strictly in terms of power and accuracy it's hard to beat for the money.