I requested some information on a overseeder a local rental shop has and this is the response I got: "We rent, at our business, a Bluebird overseeder for lawn seeding. It is a walk behind unit that is not self-propelled. It slices into the ground, drops the seed and has a flap to help cover the seed up." Does this sound like a "slit-seeder"? Has anyone ever used this particular seeder? Is this going to be a nightmare to push since it is not self propelled? Would this do a better job than spreading a layer of dirt over the yard, broadcasting seed on top and then raking in the seed? Does "starter fertilizer" help existing grass? and conversely, Does "regular fertilizer" help new seed? If I want to feed the new seed and existing grass, do I have to fertilize twice with two different fertilizers? Thank you for any advice, Joel B.