I have an old but adequate jig/sabre saw that I don't seem to be able to find blades for. I know there are T-shank and U-shank blades and my saw seems to use the latter but the blades I've been able to find recently have a shank so narrow that after a few inches of cutting, the blade angles back so that the tip trails the part fixed in the saw. It seems I need a wider shank but I can't find them. Or any kind of useful comparison between types of blades for this type of saw.
The saw is a cheap, old, no-name tool but it works it it would be nice if I could get blades for my occasional use.