I've got a good one I'd be happy to let you borrow, I can bring it to work in Hyde park any week day. It's only been used to cut acrylic so it's still nice and sharp. I must give you a heads up, if your using it for a 4" filter sock, it will get the job done; it's just a bit on the loose side for the "rim" of the sock. I think a slightly smaller size would be a little more ideal (like 3-3/4" would probably be perfect)
Let me know if you want to use it, and I'll PM you the shop address and my cell# to get in touch with me.
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