That tube replacement has been done to many of these cars, I'm sure. I believe the plans for those tubes were finalized on a hot, friday afternoon in Stuttgart, after much beer getrinken. The parts car I obtained had a sawn metal tube/rubber hose/screw clamp arrangement. I replaced it with a good, unsawn original from the other engine when I rebuilt. The only problem I've had so far is a very fine surface rust starting in one spot, but not a drop of oil yet.
