Small-diameter electronic shrink tubing works well for flexible cables and is readily available in several sizes and types. I obtained 1⁄16″ clear and ⁹⁄64″ black tubing, just what I needed for fuel lines and control cables on a motorcycle model I recently built. Just hold one end and rotate the tube over a heat source (a soldering iron works well) until it has shrunk completely.

Tip submitted by:
Tom ZuchowskiClemmons, North Carolina