I'm considering thatching and resseding my lawn. A local equipment rental
showed me a machine by Classen
(http://littlewonder.com/turf-seeder-self-propelled.asp) called a turf
seeder (he called it an overseeder) that he thinks I should use. When I saw
the arrangement of the blades - considering the machine drops seed first
then lets the 24 or so blades roll over them, my eyebrows rose; it seems to
me a lot of seed will simply fall on top of the grass and those blades will
miss them. It doesn't look like there's enough vibration to shake the seeds
down through the existing lawn and onto the furrows the blades create.

Is this a recommended way to get seed into a mature lawn that needs to
thicken to prevent unwanted weeds? Or should I rent a thatcher then this
machine to plant the seed when all the thatch is gone. The guy at the rental
agency says the machine will thach as well but not as much as a stand-alone
type.