Brillion seeder opening clogging.

I have a older 12' brillion 3pt seed. I am currently seeding orchard grass in the front box with the wire cages. There are two 6' boxes that make the 12' seeder. The center 6 holes the on each side of each box are pretty much clogging there is a small amount of seed but not much coming out. have made sure the hole opening are the same and nothing besides seed in the boxes. Any ideas? Have 20 more acres to plant tomorrow.

Brillion seeder opening clogging.