Useful for nighttime mountain biking, or for very chattery roads.
The TwoFish bike block is a double cam strap that uses Velcro as the closures. It's available in our online store in the Down Low Glow accessories section. Cam straps allow you to use a pulley to tighten a strap. The TwoFish does this twice: once around your frame and once around an object (like a Down Low Glow battery.)
TwoFish install 1: undo strap all the way.
step 2: Place block against frame ready to wrap non-velcro side of strap around frame.
Step 3: Wrap strap around frame (non-velcro side against frame) and through the buckle.
Step 4: Velcro strap sticks to itself!
Step 5: Loop strap around battery.
Step 6: Put strap through the buckle.
Step 7: Cinch strap to itself. You're done!