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I think there are small wheels on each corner so it doesn't scrape, but you are right if those shingles are not laying perfectly flat, if it catches even just a little bit...
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[–] [deleted] 0 points 3 points 3 points (+3|-0) ago (edited ago)
[–] blumen4alles 0 points 1 point 1 point (+1|-0) ago
I think there are small wheels on each corner so it doesn't scrape, but you are right if those shingles are not laying perfectly flat, if it catches even just a little bit...