DF64 Slow feeder

This is an adjustable slow feeder for the DF64 gen 2. 

I referenced the bean spinner from Gary McCormack (linked) for bean distribution however made an adjustable hole size which allows for on the fly changing of the feed rate, additionally, I've found from using other slow feeders the last few beans are hard to get without turning the grinder on and off, this avoids that by letting you increase the hole size and get at the last few beans. 

Let me know if you have any changes or what you think.

Edit - I've added a second spinner that is a bit stronger and with a couple of pop outs to move the beans a bit better, I've found it helps keep the flow a bit more consistent at the start. Also reinforced the thin walls. It should be aligned on the nut so it slides down and should not contact the funnel. If it does try and move it a bit so it slips on further.

Thanks!