Hi Bob;
    Thanks for doing the research. Wish I had the technical background, time and tools to do it myself! Sounds kind of interesting. I have several ST.60s that will need rings and will try to re-inventory those as soon as possible. I had sent Tom 6 ST.60s to rework, and he got through 3 or 4 of them. I got the cores for the last ones back from the gentleman who's name escapes me right now, and they are of the older variety with out muffler ears, and take two rings I believe. Have to worked on any of those yet? Tom warned me a long time ago that all Tigre .60 parts will not interchange and was wondering if you had his descriptions of the different varieties? I think it was posted here on the forums at one time. I would like to at least get these put back into stock for with good fitting rings and they will still run acceptably for most people that way.
    Have you done any work with the newer ST.51 yet also? I would just like to have a few spare rings on hand for spares. I have a mixture of Italian and Chinese versions. I remember Frank Bowman telling me that the only difference he could find was a slight difference in the bore, with the Chinese versions being a hair bigger, and if you asked him for a pre-gapped ring, he would ask you which engine it was for and had a dummy cylinder in which to check the gap with for the specific cylinders. A rather neat idea.
   Once we get through the holidays I plan on sorting out and organizing my engine collection and will see exactly what I might be interested in. Probably want some of the .46 rings also.
   Thanks a lot,
   Dan McEntee