Tooling-Slitter advice

[Roadracer_Al]

It's been ages since I bought my slitting saw arbor, but I recall that even a US-made arbor was pretty cheap. I chose a single-size (as opposed to the multi-size arbors) because I thought it would be more concentric. 1" is a pretty common size, and has served my needs well. It's a 3/4" straight shank, although I would have preferred an R8 shank.