roller core

I have a few very strange questions. I am working at creating a small etching press for woodblocks and some other etching. I have built one press and am thinking about building another. The problem is that, to make rollers is very expensive. I was wondering how hard it is to remove the rubber from used roller cores and how tightly the cores are machined. The other question i was wondering is how hard would it be to track down some used roller cores about 12 inches long with a core of an inch and a half or so. This may be more difficult than I imagine so it may be better to just have some rollers machined but i figured it might be worth a shot.
Thanks

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