18650 High Current Cell Holder

I was looking for a HIGH CURRENT cell holder to test some 18650 cells. Some of them can deliver over 20A, which is way too much for the spring loaded cell holders (which are fine for 1-2A charging or such).
So I designed a simple holder that can take 20A easily. It has a lot of contact surface between negative and positive battery pole, and it's make out of pure copper. The screw is a regular M5x30 screw.
So you need some copper plate (18x18mm) and copper rod (5mm diameter), 12AWG and 14AWG silicone wire and a connector of choice (I chose XT60).

The assembly should be quite self explaining.