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Just so you'll know. The dots on the cam and brake arm are to assure that the brake arm is in the right position on the cam in relation to the leverage it applies to the flats of the cam.

You can install a brake arm with the dots offset..the reason it often appears impossible is because it's been in the correct location for so long. The splines are symetrical so it you clean them good it will go on any way you want. I've often offset the dots a spline or two on a rear brake to make up for an extended swingarm or some other change in rear suspension geometry.

You DON'T want to do that to a front brake though...because it does screw up the leverage ratio.....not such a big deal on a rear brake on a race bike, or a street bike with a big long pedal.
JohnnyB
 

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Rat....ohhh...ok, different story then. You are saying the splines are either too course or too fine.
The hub looks like a late 60's to early 70's type....going by the riveted pivot posts.
Should be an easy part to find.
JohnnyB
 
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