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Thanks tester! Yes i didnt have much luck googling for my answer so i found myself here..This is very helpful. So the one pictured should ideally have a second spacer on the non-drive side as well?
guyfriday-
So the one pictured should ideally have a second spacer on the non-drive side as well?
The one in your picture does have the NDS stop collar. They are often different from side to side due to the particulars of the axle and bearing designs, but as long as there's some kind of shoulder for the crank to abut, all is well. The collar should extend enough to slightly overhang the rounded ends of the spline grooves
gbj_tester
It's a PITA googling ISIS right now, but the ring on the axle is called a stop ring or stop collar. There should be one on each side, and the cranks should press against them. They are there to provide a precise axial position of the crank on the axle, which would otherwise be uncertain due to the crank banging into the spline run-out with varying degrees of pressure. If you assemble ISIS cranks without a stop collar, you can damage the crank.