I want to replace the crinkled tubes of a tom's mini canister to something longer. I find that the included tubes are too short, and too rigid to for placement. What size are the tubes, and does anywhere sell it? I tried looking at the online petstores (Dr fosters, Big Als, etc) for replacement tubing, but since I'm not 100% of the internal and external size of the tubing, I don't know what to get. Any one know, or has replaced the tubing on the toms mini canister?