I have a very nice 80's Columbus SL fork with a pantographed internal-lug crown. Recently the fork suffered some minor damage. Is it possible to replace just the blades of the fork and use the existing panto'd fork crown? Would the process be expensive? I'm curious to know if this is even an option. Thanks.
If the original blades are brazed onto the crown, you should be able to have the old blades removed and new blades brazed on by a framebuilder. If you can find suitable SL blades already fabricated (with appropriate rake, dropouts installed, and the tubing shaped and dimensioned for the crown lugs), it shouldn't cost more than a couple of hundred dollars, about the cost of replacing a top tube or a down tube.
If the framebuilder has to build up the blades, it'll be more expensive.