Do you know anyone with an exhaust cutter, or a large pipe cutter? You can open it by carefully popping a hole in it near the base with a chisel or screwdriver and a hammer, then continue to open it using tin snips.
I don't know what that is, but I'd be really interested to see the inside of the filter.
I don't know what that is, but I'd be really interested to see the inside of the filter.