RE: TT91 FS overprop'd?
Hugh,
I have only been dealing with them for over two years now...
The Clubman series? I always ream them to size and shave off all the sharp 'casting slag'.
After that, I have not needed to balance even one of them.
...And I do check each and every one of them, with a finger-tip balancer, before selling, or mounting them.
No returned samples either.
You must of encountered a 'quirk'
The woods are a real hit here, as are the C/F.
Most competition participants use them specifically, unless they have to endorse a hobby-shop, or something... who sell another brand...