I've been looking for exactly this sort of gadget to help handhold my FA* 80-200. B&H has both kinds in stock for $39.95:
Home -> Cameras & Photo Gear -> Body & Lens Accessories -> Battery Holders & Grips -> Voightlander
Alan Chan wrote:
Cosina makes one (if it's similar) for their "Voigtländer" line of rangefinders.
2 actually. :-)
http://www.cosina.co.jp/angle/