I often sow grass seeds, but not in enough quantity to warrant the purchase of a lawn spreader. And casting the seeds by hand often results in uneven coverage. No matter how hard I try to let the grains sift slowly through my fingers, they always seem to land in piles.
My solution is to convert a tin can into an oversize saltshaker. I punch holes in the bottom of the can with an ice pick or a hammer and nail. Then I fill the can with seeds and shake it over the area I’m seeding. If the holes aren’t big enough, I enlarge them slightly with a screwdriver and then try the shaker again. I repeat the process until I get the desired flow rate. With holes the appropriate size and using an oscillating wrist motion, I can get seeds to fall evenly from the can.