Miranda crank arm bolt o-ring?

Guidz

New Member
Does anyone know if the little o-ring on the crank arm bolt DOES anything other than keeping the washer in place? I pulled mine the other day to service / clean the crank and, upon reassembly, notice that one crank arm bolt has one and one does not. Does it keep out water or anything? Searching the Miranda site and pix on the net, it is really hard to find any info. The thickness is a tough one to match locally. Thoughts? Put on a little thicker one (only one I can find) or leave it off? [pardon...forgot to credit that I "borrowed" the photo from another fine member here!]
 

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