SOURCE: Where can I get a replacement (rear)rim for a 20
You can get a replacement rim at any vick shop near you.
SOURCE: my kids mongoose mayhem bike has a 6 spped gear
Being highly mechanical, this is a job for a trained Bike Mechanic. Get him to show you how to do it and you will be self-sufficient in the future.
It sounds like the gear cable is rusty or bent (requiring replacement) or needs lube. The upshifts occur solely from spring tension in the rear derailleur. Too much resistance in the cable housing and it won't happen reliably. A little maintenance will go a long way.
The 2 small screws are for the high and low limit of the derailleur to keep the mechanism out of the spokes or the chain from being positioned outside the smallest gear. They have nothing to do with individual gear selections.
Look at this for detailed info...
http://www.parktool.com/repair/readhowto.asp?id=64
SOURCE: I need to put the
Web search "install brakes on bicycle"
Look here http://www.parktool.com/blog/repair-help/categories/brake-service-and-repair
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