Ok I will try that, though perhaps I have more chaff than what you’re used to. I basically crumbled up dry colas, so I’ve got a bunch of chunks of bud amid the seeds and finer biomass. Do you think your method will work in this situation as well?
Yep I reckon. And if you put the dry material on a screen and rubbed it a bit first, it may do a good job of roughing and loosening it all up a bit, prior to doing what I suggested.
And if you tilt the screen, the seeds will roll to one end all the same. I'd at least give it a go.
Putting it all in a tea towel and rubbing them together, same as you would to remove chaff from nuts would work too. Only you'd probably be wasting some material...
Obviously low quality, though the screen might give you some kief too.
Just give the screen / cardboard a bit of a jiggle, so the seeds get a roll.
Good luck!
P.S. You just want some friction. For the most part your hands and material is more than sufficient. Wouldn't surprise me if a screen isn't necessary at all as it is.