Anyone work on Daisy ‘cheap’ air guns? Worth the effort?

Hi. Army Cadets use 'em up here. CF took all the real rifles away years ago. Budget cuts.
I'd be thinking working on 'em would be a good badge project. Just plain fun for the guys anyway.
There's a manual for the 840($89.99 each to replace) on Daisy's site. http://www.daisy.com/node/55
One for a lower end 901 is here. http://www.daisy.com/node/103
And for the even lower 880 here.
http://www.daisy.com/node/3

I agree with the above poster.

Why aren't the boy scouts learning how to fix them? Seems like a golden win-win opportunity. Teaching skills and repairing tools.

Had a Crosman model 1300 airgun pistol that sat unused for many years. It had poor pressure. Tried oiling it in the provided oil hole. It actually seemed to get worse after oiling. Several weeks later tried to oil it some more. Still no pressure. Gave up on the project and put it away thinking it was hopelessly broken and that I had over-oiled it. Now 6 months later I try it again and voila!, it is holding pressure. Checking one month later and it held the pressure for the whole month. Some old airguns might need an overhaul with new seals but some might just need a bit of oil, or in some cases plenty of oil.

Don't know about new models, but any older model parts and seals can be found at Baker AirGuns out of Ohio (link below). Dennis, the owner is a great guy. I was repairing a Model 99 that was my constant companion as a kid and called him up; he sent me a seal kit, instructions, and a free tool needed to disassemble the darned thing. Great service, great info.

http://www.bakerairguns.com/

Here's a web site showing how to repair the Red Ryder:
http://css.treenut.net/projects/bb_gun/
There's others on youtube and by a web search, too.

another site that has some good photos and instructions of repairing a Red Ryder Model 94
http://www.rifle-company.com/phpbb3/viewtopic.php?p=78465

ETA: I also wanted to address the topic of it being worth the effort to repair old, cheap air rifles. IMO, the only way it would be worth the effort is if there was some sentimental value to the piece. Replacement parts will generally end up costing more than the actual gun, especially if you include shipping costs and time involved. In this case, though, if you can get the troops involved, I see value in that so I would think it would be worth it.

Before you move on that project ... check out the prices for replacement models. Once you can get an estimate on the repair/restoration work, since this is for Boy Scout usage, not collectables, see which if repair is cost effective versus replacement.