Never heard about it. Have you some exemple of it or where to find it?
Thanks Paolo for the suggestion. However, we find another way: bought another hub like this with the correct spline diameter:
then, the spline has been removed from the old hub and then replaced with the one removed from the one just bought, molding the inside of the old one with a lathe and then adding new bolts to fasten it; easy, isn't it?
I expected to finish the work before the beginning of august but that isn't possible. Now it's trimming time: