Bill,If you could sort out an oversize lower guide, I would have thought someone near you could put a bigger thread and make you a special thread ring ?, Just a thought. Cheers Bill.
Funny you should write that. I was just seeing what material is used for the valve guides, 630 bronze seems to be it. I'm waffling back and forth with whether to make up the slide in cup device TT suggests or get the threads repaired back to original size, or over size. I was also thinking that if I sent it out for repair I would get no-lead valve seats installed. But the valve seats look reasonable, so I might pass on that. The club does sell over size guides, I have to see if I need them or not, or an over size outside of their range. I see I can easily buy a tap in larger sizes and making a ring is not an issue. I think I talking myself into doing myself.
Stay tuned.