On my 77 300d a vacuum line going to the driver's door has a cut in it. The lines passes through a rubber tube into the door at the hinge. I think what happened was that the rubber boot which protects the line from the metal edge of the hole in the door, came out and the line chafed against that metal edge.
I'm considering cutting the line the rest of the way and putting it back together with a piece of rubber vacuum hose. Anybody else done this? Anybody see any problems with it? It saves having to pull the door and footwell trim pieces off to replace the whole hard plastic line.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13