repair angle grinder gear?

[henryarnold]

I have 4 of the inexpensive Harbor Freight right angle grinders #91222. They are surprisingly reliable with light use. I usually pay about $15 a piece for them. I have one set up as a grinder, one as a sander, one as a masonry saw, and one with a cutoff blade. The masonry saw unit has seen some fairly heavy use with concrete dust and heavy cuts and is still going strong. I wouldn't bother trying to fix a grinder that had a serious problem.

http://www.harborfreight.com/4-inch-angl...91222.html