I currently have an order in for a 1680 case from Yuki. After RoninQ's post I sent Yuki an email.
This is what he said:
Please don't worry.
It is very long time ago, because we have been change ThIS supplier.
We don't have case with gluing in the crown tube right now.
Another question:
Bought a nice Vintage 60's ROLEX OYSTER PERPETUAL DATE Ref 1500 on the bay.
I plan on using the movement for my 1680 franken project.
Will I need spacer rings or additional parts to have it dropped in my Yuki case?