Andy, thank you for tagging me.
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JGLeas, I agree that Larry's shop is great for old bikes even though you may not see a lot there when you visit. Larry is in his 80s and has been a bike mechanic since he was a boy. He has seen it all and can do all the old things and all the new things. Larry is on W 110 St, convenient to the true center of Manhattan, i.e. the Upper West Side where I grew up. Fun Fact, the street in the center of the Island's length, is 86 St.
And there is a guy named Pedro who works at Waterfront Bicycles on West St at Christopher St, in the West Village. He is quick, precise, knowledgeable, and strong. He's not old, but that's not necessarily a bad thing.
I live very near the shop in the West Village.
If you're in Washington Heights or Inwood, now fashionably known as Upstate Manhattan, you could stop at a shop called Tread on Dyckman St.
I have spare Campagnolo parts from that era, taking up space in my junk bins, so if you need any parts or expertise, let me know. I've worked on tons of Raleighs from the 70s and I own a few right now. You've got a lot of Raleigh afficionados locally, willing and eager to help.