Hi,
It's made of Paul Haller switzerland, he sells it thru [link]http://www.igmustang.ch[/link]. I payd about
130 Euro delivered(good price). The only obstacle with the Robartretracts is that I learned that they are a bit of sloppy when they put in the formers at the factory, so they are not put in at equal distance. I discovered that after doing one half. It's not a big problem. I saw that you asked about reductiondrives. If you go to[link]http://www.igwarbird-germany.de[/link] and search the gallerys you gonna find alot of pics for Ralf Borcher
drives he also makes the fourblade prop. I haven't been in any contact with this guy because of my very bad german. He's got a mail but not a site. I think that the fourbladeprop shown on warbirdpropdrive actually is a Borcherprop.
Thanks Tobbe