Now those (pics 1 and 2) are an idea I hadn't thought of at all...
You have set the mental gears working ... changer body as the "rail" for the pump (
only drooled over PGP pictures for ~1yr and never thought of that
Should work... no prob. (Except wife objecting to time spent on working it out
And I've got to make the changer
Thx guys!! I may have passed a bottle neck in my project thanks to you!!