Interesting reading. First let me say that I have no connection with Top gun or Hellion other than I tried a early Top gun PS with fairly good results.
I am in the high perf engine business and I have balanced hundreds of automotive engines so this thread caught my eye. I read Top guns explanation of how he does his balancing and although it is a little hard to follow... because English is not his native langauge... I did find his method to be sound. While using a bob weight (as he suggests) works best with a spin balancer it will also work with his static balance method... many people still balance Harley's this way. I really don't understand what all the fuss is about.
That said.... I don't recommend the average guy trying to balance his .12 motor just from reading a couple of paragraphs on a forum either. A much more detailed explanation with pictures would help people understand Top Guns method better.