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Jack,
The other pulley is the accessory belt idler pulley and it's held on by an allen bolt that uses a 6mm hex wrench, IIRC. The bolt head is normally hidden from view by a flat plastic disc cover that snaps over the outer race of the bearing. I've included a picture from FastLane of the tensioner assembly that uses basically the same idler wheel. If you look closely at the picture on the right, you'll see that the disk has a small rim that you can get a couple of wide-blade screwdrivers under and pop it off to gain access to the bolt. It will very likely get broken in the process though, so buy a new one when you get the bearing bracket. Also, spin the idler pulley and check for any roughness or noise. It should be very smooth and quiet. Any roughness or noise is grounds for replacement.
Cheers,
Gary
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