A how-to regarding saw chains...

[woodchuck]

Here's a thread on the intricacies of hand filing a chainsaw chain, it's long but is worth a complete read, with some exceptionally good pictures of the cutter before/during/after filing.

Most of what I know has come from many hours of reading on ArboristSite, and practicing what was discussed.

http://www.arboristsite.com/showthread.php?t=20869&highlight=Hand+filing+gypo

[Weston]

looks like an interesting site.

[woodchuck]

That's one way to put it.:)