They do.
Yes, they do bike assembly. Had a bike rack assembled, cost was $35. REI members get a lower price. Have found mechanics to be very knowledgeable for bike repairs and bike tune-ups. Stephen is the go to guy for excellent repairs and service. Work is done on a timely basis and done when they say it will be done.
Not sure about that but I'm pretty sure they can help with it or direct you to the right place.
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