Hi, Hoping someone with some sense can help. I've being having problems for a long while now with 4 1/2" and 9" anglegrinders that I cannot seem to fix. The trouble lays with the grinder 'snatching' while using metal cutting discs. Recently, I had a new 9" disc burst when the grinder suddenly snatched. Good job I was wearing goggles. Am I using the grinder 'upside down' ? and thereby the disc revolving the wrong way? The snatching seems to only be when I've been cutting a while ..... is it because I have relaxed my grip? and holding it too loose? I've just cut some concrete blocks and the same thing happened with the 'snatching'. Any helpful comments welcome, especially where safety is concerned. Cheers Brad.