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I agree with Pete. A two stage blower IMHO shouldn't scrape the ground although that is what the 3rd setting on the Hondas are for .
It works great till you hit a crack in the driveway or sidewalk . I tore a peice out of the Snapper blower we have at work two years ago because the skids were set too high and the scraper too low. It was a very sudden stop from fourth gear.
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Tom
Stihl 036/MS-55 YB /Homelite Trimmer/ Troy-Bilt Tiller/ MTD Rider/ Honda HS1132TA