Morning folks,
I recently bought a lovely 1976 Holdsworth. The frame's in great condition but unfortunately the teeth on the chainrings are worn away to the point that the chain falls off and the gears slip if I put any significant pressure on the pedals. My LBS told me that I'm screwed because it's going to be impossible to find another chainset the same size, as they're not produced anymore. I'm a total noob when it comes to bike maintenance but is this really the case? I'm really upset to think it's the end of the road for this lovely old bike

Thanks in advance for your help