My memory for names is terrible. Always has been so it's not an old phart issue. Anyway one of the gals here recomended the aquarium tubing some time back so on a trip to Wal-Mart several months ago we got a package.
Here is what I found works the best ... so far:
Wrap the tubing around the pullys, through the guides and around the hand wheel as if it were installed, then gently pull on it to remove the kinks and bends of being in the package. Once that's done, put the end against the tube and cut it there. Do not stretch it more than to take the kinks out. After you've cleared the extra out of the way, cut 1" off the piece your gonna use. Cut that little 1" piece lengthwise and roll it up tight. Stick the rolled up piece into one end of the tube, then with the tubing through all the places and guides, stick the other end of the rolled up piece in the other end of the tube. Wahlaaaa, you just made a belt.
As sensitive as leather belts are to oil, the tubing belts are worse. You've got to keep them free of machine and hand oils too.
Joe