i got a really old 2 row planter a few months ago. can't find any different plates for it. the current plates are for corn. i want to plant sunflowers. i put the planter on the tractor and put some seed in the hoppers, then turned the wheels. i turned it for 30 feet then counted the number of seeds that dropped. each hopper dropped about 115 seeds, that's about one seed every 3 inches on average. it dropped them in clusters of about 5-8 seeds per drop. the notches in the plate are too big.

does anyone have any suggestions on how to make the notches in the plates smaller? some sort of tape would probably work, but i'd like to get it right the first time and don't want to waste a year because the mods broke down while planting the sun. what sort of filler in the notches would work best? duct tape, scotch tape, bondo, hot-melt glue, fill the whole notch in with epoxy then carve out individual notches? thanks.