I finally went ahead and purchased a Mental Block from Katsuhiko Okamoto at the following websitehttp://isweb41.infoseek.co.jp/play/puzzle3d/index.html
It took some time but it was worth it. The quality of the puzzle is excellent.It came with instructions. All communications were really good. If you want some very well made rare puzzles this is the site (For your information, he is currently not making the Pyracue or Offset Fisher).