"He who marches out of step hears another drum." ~ Ken Kesey
This may sound crazy, but I have friend who says he uses a paint shaker to loosen and make creamy "plastisol ink". I haven't been there to verify it, but he's a firm believer in it.He says that he can even use the shaker to loosen up wilflex gray to a creamy state. I'd like to see it for myself that it works. If it does then ebay has them all over the place.
don't know if you can source these or similar but they are great for turning over ink and dirt cheap.http://www.walmart.com/ip/1gal-Paint-Mixer/17165772mooseman