These are made with small guage saw blades, the smaller the better. It's best to end up with about 1 m of chain. The trick is to find a chainsaw shop, not hard in places where a lot of logging is going on, willing to completely dismantle the chains and put them back together with teeth on both sides, spaced so that on each side ca. three normal links lie between tooth links.
© Barry Hammel 1996