Vacuum from a 12v tyre inflator?

Yes. The alternative is a domestic refrigerator compressor which will pull a near vacuum.

The video showed an electric motor driving a small piston, there were two one way valves in the cylinder, one in, the other out, modification consisted of cutting off the pipework from the output side and attaching new pipework to the inlet side ... the gas doesn't get sucked through the motor.

alan_m used his keyboard to write :

Thanks - I have found a way to modify one....

Often its a good thing in beer,

Indeed, Newsy. And for very small volumes like this, some sort of hand operated pump would be far more effective and convenient.

Reversing the motor will have no effect, as it just drives a reciprocating piston in a tube with non-reverse valves to create blowing rather than sucking.

Probably the case , I thought after I pressed send it was too simplistic and rather than add a NRV he should see if the existing one can be turned around.

Looks like the OP has found a solution anyway. Personally I would get a cheap aquarium air pump as they are very easy to reverse the valves on and no faffing around with getting 12 volts, just plug it in .

GH