Here is a kit that languished on my shelf for over 20 years that I built 2 years ago. Reference material was skimpy at best but here is what I used: WS Vol 7 No. 4 pages 13-15 and WS 24 Vol 2 pages 20, 21. I have no idea where I acquired this kit; maybe someone snuck it into my stash making me think I purchased it. I plead innocent to all charges but here it is anyway.