T64 Grinder - 64mm flat burrs, retention test and burr chamber

This video tests retention, well mainly dose consistency with and implied low retention. one bean caught me out and caused a slight discrepancy as you will see. I also pull a second shot and talk a bit about burr options.
The power brick you see is for my cabinet lights, the grinder plugs directly into the mains and is 230/240 volt. The grind cup, extension funnel and forks are all for the standard 58mm porta filter and made of good quality thick aluminium, not plastic
The grinder in the video is a prototype and doesn't have the extra movable zero collar, the revised grinder does, and it means the zero point can be adjusted should you ever change/use different burrs. The BB grinders will have this as standard.
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