I to have one floating around in the tool box some where.
I agree, they are junk, and should not be concidered as a real tool.
Over the yrs I have been making my own arbours for slitting saws, and Ive found the arbour can be made right on the money, but the problems dont end there. Many of us buy the saw blades from offshore companys, and they many times are just as bad asthe darn arbours. I have a half dozen slitting saw blades that I bought from Busy-Bee, here in Canada.
I know for fact my arbours are of the best quality I can produce, with run out in the tenths. Yet I can mount up these saw wheels, and start into a cut, and as it spins around a few teeth will come into contact. Ive got a few other saw wheels from KBC, and paid good money, but got saw blades that seem to use all the teeth as they cut. Those cheap saws , Ive tried more aggressive feed to get more teeth in the work, Thats a wasted effort.
Slitting saws them selves can be just as much trouble as the cheap arbours. Been there, done that, and broke a few trying to use them. Im not sure just what the deal is with the cheap saw blades. I have no idea how they make these things, but appears like the hole for the arbours is off centre. Though if I have to, and willing to stand at the machine to get through the job, even one of those crappy saw wheels will still get er done. But for the troubles, I usually look for another way, but you know how it goes, some times , it just needs to be cut with a slit saw.: Bummer: