I just pulled it back appart & measured everything with a digital caliper.
The bearings measure .269mm "wide" each...
same as the old ones (I was worried about that.) Two bearings should measure .538mm. I tried to measure the assembly but got .550mm! These tollerances are impossible to see or measure...
The center tube measures .555mm. LIkely the center tube is not pefectly centered... How would you know?
The bracket is aluminum & has a certain amount of flex. The issue is the idler bearings seem to turn hard. Maybe I need to spread the bracket slightly & cinch it down as little as possible.
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