I found a big 'sieve' at a local restaurant supply. The holes are a bit bigger than the flour sieve I have, maybe about 1.8mm. Took not much time to rub my weed through it, and the result was a nice consistency. Would roll up nicely if I was into smoking any more. I like the idea that there are small, but visible pieces of a consistent size. If I used a blender or food processor, I'm afraid I'd always either end up with some larger pieces, or just powder. Sure it's not that important, but pretty small investment, and easy to use.
Not sure due to what, but after boiling down my tincture, it's just not getting to the thickness I expect for RSO. At some point, it seems to stop boiling, and from there it reduces VERY slowly. It's sitting in an open 2oz glass vial at room temperature now, and it's loosing about 3/100 oz in weight each day. Right now, it's about 1.65 oz. in weight (50 grams), way more than I can reasonably expect in yield if there isn't some residual solvent. I'm going to start a separate thread on the question of the best ways to FINSIH making RSO.