I bought the cut off wheel at harbor freight for like $15 bucks man.If you don't have a sawzall -- or a friend with one -- what would you use to cut the inner liner? We are rubbing on a 1/4" of our inner liner that isn't even affixed to anything. But it's like some sort of vinyl, and I don't know what to cut it cleanly with. I guess I could use my pocket knife... But I'd rather not.