Here’s a good tip I learn the other day at Shannon’s Hand Tool School: my carcass saw was a little twisted and it was driving me crazy to saw straight. I was thinking in sending the saw to the manufacturer for fixing it (I live in Chile so we are talking about two international shipments), but I get this tip:
It’s possible that the twist is caused by lack of tension in the stiffening rib… Just grab your saw by the blade and give a couple taps with a hammer in the stiffening rib so it could recovers their tension.
Just two taps, not very strong ones and the saw is straight again.
How about on metal backs? I have a 12″ tenon saw that isn’t TOO corroded, but I can’t be certain how much rust is in the spine. If it’s rusted up in there, does that mean that this method won’t work? Or what is exactly happening when you whap it like this? I mean, does the folded back actually move around a tiny bit?