[MrForbes]

We're too darn lazy and cheap to do something like that (we did find the brushes offered by McM). The students played around with different stuff the first week, and discovered that flaps of shelving liner work pretty well, so we used a couple dollars worth of shelving liner with flat aluminum stock to hold it to the sewer pipe, the shelving liner has a flap about an inch wide on each side of the aluminum. No special ordering of parts....just some drilling and screwing, and it's done.