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Originally Posted by IslandTractor
Will a drag harrow (the type that looks a bit like a chain link fence with barbs) do a good enough job at scraping up the surface before overseeding? I have a landscape rake but that really rips the existing grass right off and what I really want to do is supplement the existing turf, not replace it.
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That would probably work decently. Major question is what grass is in place now - if it is a sod-forming grass like bluegrass or brome, overseeding will be a lot more difficult than if it is a non-sod-forming grass (almost everything else that grows in the north).
There are dedicated overseeding tools that combine a mild scraping action with a seed drill and cultipacker. As you'd expect, they're ideal for overseeding. Probably way too much money to buy one if you aren't going to use it every week, but you might see if you can find one to rent.