krakhaus

I have been considering the aluminium can shim- it may come to that. I have a lathe so turning down an oversized seatpost is also a (possibly more elegant) solution.
regarding the build-

crank is DA 7400 which I wanted for the square taper bottom bracket and for the overall slightly retro look. I also wondered about the 10sp/9 sp thing but it's fine. shifts normally from big to small chainring.
overall the setup is very smooth and the indexing is spot on.