I've notices several threads on angle grinders, drills, etc. and thought I pass along the best place I've found for repair/replacementparts: ereplacementparts
. If this sound like a plug, well I guess it is - they're great! They have parts for most major brands, (more than 20 brands) and they have outstanding service and great prices. If they don't have it but can find it, they will. I've ordered parts from them over a dozen times during the last several years and and have ALWAYS been satisfied. I once ordered a set of brushes for a 4" Makita grinder, using the Makita part number from Makita. They sent me the brushes I ordered (they had the same part #) but it turned out they were the wrong brushes. Ereplacenments contacted Makita, got a corrected part number and a superceding part # and I had them in just a couple of days - at no additional cost and they didn't want me to return the brushes from the first order. I've spoken with their customer service people on several occasions and they've always been very helpful! They even try to stock up on 'soon to be discontinued parts' and they provide parts schematics for all the tools.
One other note. While not a good as ereplacements, I've found Harbor Freight to be pretty good about parts, once you get to their customer service department. I was given an older belt/disc grinder that was just missing a couple of parts so I decided to try and restore it. I called HF and the customer service rep found what I needed in about a minute and the parts were unbelieveably inexpensive! The drive pulley was $1 and the vbelt $1.18. Similar parts at my local Ace Hardware store cost $18! And I also found out that you can download any product manual from their website. As many people here have, I've found both good and bad stuff at HF, but more good than bad. The quality of there customer service, at least for me, is better than good.