Does anyone use equipment made by Helmut Weber/Westmark Industries/Raytex, from Perth, Western Australia?
I notice he/they make an Leica screw pinhole body cap. I don't know about pricing or availability -- I just got outbid for one on eBay Their website seems to be a little out of date: <http://www.geocities.com/westmarkwa/wme1.htm>. It has the same angle of view as a 25mm lens, so if you've got the Voigtlaender Snapshot Skopar 25/4, you've got the viewfinder for it. cheers, Stewart