Originally Posted by JohnDThompson
Just try it and you'll find out why it doesn't work.
What I found out is that the balls are not held securely if they're not the right size. Up to 3/16 they are jumbling and trying to squeeze out between the cup and spindle, and not giving that smooth turn. Usually I'll work with subtracting balls to resolve this, but in this case it's not worth it. I don't believe they are fully contacting the ground surfaces on both the cup and race.
John, please give a more substantive explanation of the problems you've seen in trying an installation like this. I presume you have done so, and that there's more you can say.
So John, I have gone back to the original 11 1/4" balls per side. The adjustable cup sticks out 3 mm. By itself this is not a problem, you are correct about that. However in this case (please refer to the last paragraph of my original post) the Avocet cups have a rather short length of thread, and I'm concerned that there might not be enough threads holding it in the BB shell.
I have two more remedies to try. One is to replace the Avocet BB cup with a Shimano, which I think has a longer threaded area. Another is to give up on the Avocet spindle. I've advertised for the 4-68 spindle (I have the 4-70) in several places, with no positives.
But (@Hendo252) the Avocet spindle is uniquely a match for the Avocet crank, so while BBs are cheap, BBs that fit can be a PITA to find. I've test-fit an Avocet arm on a JIS spindle, and while it will torque up, it leaves only 1 mm clearance for the end of the spindle. This is less than the clearance resulting from the Avocet spindle. So if I give up the spindle I give up the crank and (those who read all of my original post) that crank combination fits with the big and widely-set chainstays very very well while giving me Q of 150mm. Pretty good for a triple!