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I've got a couple of old solenoids with fine copper wire in them that I use to replace broken crosshairs. I'm not sure that I'd go as far as they did in the 'old days' and use actual spider web as the hairs!
The other thing I thought I would comment on is that the hairs need to be in the focal plane of the eyepiece, and that is not always conveniently at the end of the barrel where the filters go. From my observation of fixing broken ones there is usually and extra ring that gets screwed in up the barrel that hold the hairs and can be placed in just the right spot. This could make it a bit tricky to fix one up at home - something I've thought of doing myself occasionally too. Let us know how it goes, with pictures!
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