Maybe one of the other Paasche users can help you here as I have never used a single-action airbrush, but I would put it on any moving parts and the needle.
Just for the record, "Regdab" is Badger spelled backwards.
Most refer to is a Badger Needle Juice.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon