Короче порылся ещё по этой теме. Наш народ таким не заморачивается, в основном пиндосы тулят всякие переходники
Вот неплохо:
My uncle is a retired machinist with a bridge-port in his basement. I took measurements of my dropout (which was cut from flat stock, not one of these fancy cast dropouts you see on modern bikes), drew up the adapter in CAD and went over to my uncle's place to cut it out.
We started with a .5" thick block of what was probably 2000 series aluminum plate my uncle had lying around.
Finite Element Analysis in Solidworks (solidworks simulation) gave nearly identical fatigue outcomes for 6061 vs 2000 series Al with this part under normal breaking load, so i didn't have to be picky with materials. No 6061 for me. but were dealing with a solid block not a butted tube.
My total monetary investment for this project was a subway sandwich, as payment, for my uncle's trouble. The part took a couple hours working on his mill, so expect having something cut at the local machinist will probably cost a penny or 2.
Best thing to do is find someone with the tools who will do it for some beer, etc
Side note, this adapter was cut from a solid block simply because i had access to a mill, but the same could have been accomplished with 2 pieces of flat stock cut on a ban-saw then bolted together.
