Game on!

[Voicecoil]

Got the machine up and running, then realised I needed to get some coolant sorted before cutting anything much in the metal department. Rather than reinvent the wheel from scratch I thought I'd start with one of these off the Bay of fleas:

Trying it out it seemed to deliver coolant without too much fog, but was rather feeble in the chip clearing department running off my rather low pressure air supply..Dis-assembling the thing it is made of 4 parts like so:

the inner coolant nozzle has the same pitch thread as the outer collar, so threads into the collar when it's put on. The lack of puff looked like it was being caused by the very small apertures:

Then I noticed the internal diameter of the yellow plastic end bit looked like it would fit a bit of 6mm AF hex bar, and that the collar and final guide had the same M10 x 1 threads. So I turned and slotted a bit of 6mm AF hex brass to make an alternative inner piece:

This push fits firmly inside the end of the yellow bit thus:

Screw the conical end guide back on and hey presto there was a good blow & coolant, quite a decently narrow stream too, about 10mm diameter at 100mm distance. And the bits cost less than a fiver