I am chatting with a chap who is testing a range of coffee baskets with a DF54 grinder. He is struggling with channelling with a couple of beans, and not with others. I made the point that he would be better off trying to test using a more popular burr size. I think it more likely his target market will be 64mm or larger. That said, what particular problems will using such small burrs throw up, possibly distorting his test results? Or am I talking rowlocks!