Tennessee--I'm glad you stopped by and had a look. I was thinking of how you jumped in and defended me on my very first post on this forum, when Jo wanted to pin my ears back because I was posting something other than an engine build. This has been an interesting project, and even though I have been designing automation for many, many years, designing it and building it as a working model are quite different. I do get tired of building engines. At last count I had 23 engines I have built from bar stock, and although it is very rewarding to build an engine and see it run, after a while I like to do something a bit "different".----Brian