Did some experimenting on a mineral tub. Took a 10' rub and tied it under the flap of the rubber using the face flyps that go with the rub. Drilled (15) 1/2" holes in rubber lid - roughly 8" apart and 3" from edge. Seen a commercial product that did basically the same thing and thought it should work.
What is the suggestion for best insecticide? I was thinking Ultra Boss with diesel, but maybe Ultra Sabre instead?
Adds a fair bit of weight to the flap, but the cows have no problem getting under it.