The '74 or so NR issue two bolt affair has two hold down clamps, that are held in place by 6mm bolts. One has a space a bit wider, for the rails, while one is right on, rail size diameter. Also, the doohickey that these two clamps butt up against has a sort of notched end as well.
I've never figured out (or have been told, which is a more likely scenario), if there is a front or back and why.
Can anyone shed light on this question, which has been nagging me for the last 30 yrs?
Anyone out there have a "Carnevale" bicycle, besides me?
Wes Oishi
Los Angeles