Here are a couple of pictures of the cooler unit.
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Just to add this will probably hold around 25 litres and not 10 like I said in an earlier post. Got my sums a bit wrong.
I have made a little control unit with a couple of switches, an estop and a pot for controlling the speed of the spindle. I need to have a read through the VFD manual now to see what to set up for it to take an external input for start/stop and speed control.

Ian