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Hi Guido, I think I might risk voiding the warranty on a Harbor Freight angle grinder to get the extra surface area of a 5" disk. I found and measured a few used disks today to see what the average size was. The smallest I found was over 3", and was looking pretty ragged. But assuming you could use a disk down to 3", you would get 5.5 sq. in. of useable grinding surface from a 4" disk, 8.84 from a 4-1/2", and 12.57 from a 5". That's a significant increase in grinding surface by adding that extra 1/2" of diameter. How do 5" disks compare in price to 4-1/2"? I once did an informal test comparing the lifespan of a 4-1/2" Harbor Freight grinding disk against an American made one of some known brand. My memory is that the American one didn't significantly outperform the Chinese one, but I don't remember now whether that was a straight performance comparison or if I took cost into account. In any case, I'm not praticularly happy with the life expectancy of H/F grinding disks. For any serious amount of grinding, I seem to spend as much time changing the disks as I do actually grinding. Have you come up with anything better? All the best, Stan
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