Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
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By 'wiped' I assume you mean 'ruined.'
If you are looking for the cheapest possible solution, Dura Ace may not be it.
THe funny thing is, the chainline for modern Dura Ace should be similar to that of an older road bike. What type of derailleur does the bike have? Is it an old 'piston' style Simplex? Because that is the only thing I can think of that might limit the movement of the front derailleur... provided you have the lower limit screw all the way out, and the derailleur properly aligned.
Anyhoo, since you are using friction shifters, you should be able to replace the old derailleur with a basic modern one without any problem. Look for a less inexpensive model designed for 7 or 8 speed chains as that should give you more room for the wider chain on an old bike.