I am old. Pollen tumbler? Wtf is that?
Anyway, never mind......grow plants from seed, when they introduce themselives as male, let them grow to NEAR(!) maturity, cut off the longest branches and stick them in a cup of water away from your females. Make sure the male branches are over a CLEANED glass table under a light. Get pollen with a razor like you'd lay a line of coke. And collect.