Josh Volk, of Slow Hand Farm and author of the equipment column in Growing For Market, just posted a great roundup of more Earthway Seeder information and modifications, ranging from ganging together multiple seeders, to adding on a wire scraper to keep soil from building up on the press wheel.
Vegetable and/or Flower Growers, Small Scale Farmers
Range of how much it might cost to build:
$90 for the Earthway (only if you don’t have one already) and the cost of the quick adjustment is cheap, most likely under $10
What skills are necessary to complete it:
Just about anyone can do it. You may need to introduce yourself to a saw or drill if you haven’t before, but otherwise it’s a very accessible project.
Summary of the project:
The Earthway seeder is a great tools considering it costs only around $90, and allows you to seed a huge variety of seed types and sizes. But sometimes when using small round seeds, like arugula, the seeds work their way behind the seed plate, which can begin to pulverize the seed, and keep the seed plate from rotating properly. This modification helps with that.