All -
Thanks for the well-informed help.  
No, I've never greased the spindle.  I always figured that the crank arms 
are one of the few parts on a bike that rely heavily on friction to stay in 
place, so the thought of greasing 'em up never really occurred to me.
Given that I've put about a thousand miles on this crankset and the problem 
is only now manifesting itself, I'm inclined to agree with Joe that the 
problem stems from the first time it came loose and I simply rounded off 
the spindle hole.  I'll try another arm and see if that helps; as this is 
my main commuter, bike I'm not inclined to experiment too much for fear 
that things will come apart half way to work.
All the best,
Kevin

On Tuesday, October 24, 2017 at 5:52:17 AM UTC-4, Joe Bernard wrote:
>
> Unfortunately I think you rounded the spindle hole the first time the arm 
> came loose. Now it's sitting on the spindle with a not entirely uniform 
> friction fit, which causes it to gradually wiggle itself loose, then the 
> rounding continues. Maybe someone here has a stray left Sugino arm hanging 
> around? 

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