Shayne said:
... chainring bolt usually goes through both the outer and middle rings. There should be no teeth in the way of the nut on the backside.
...
Yes, the nut does have a long "sleeve" that fit's through the rings.
I've put the hex (bolt) on the outside, the nut (stupid shimano tool) on the inside.
When assembling the crank/rings (off the bike of course) & looking from the inside, all but the one hidden by the arm (Which has nut/bolt reversed from the others) has the middle rings teeth just enough in the way preventing using a screwdriver in the slot straight-on.
In the past, when I've used non shimano rings, some times the bolt will "go in" farther than
"normal", and the end/tip of the bolt goes past the end of the nut, preventing me from using a screwdriver at-all. Must use the shimano tool that I would describe the end like a cross, so the tip of the tool goes in the nut head-hole, and the sides reach down farther to catch the nut indents on the sides to hold while tightening.
There also is a difference between HG and IG rings, with a indent on the nut side to recess the head a bit, but a lot of non-shimano rings (even shimano's small) do not have the recess in the bolt-side...