The T-block clamps to 1/2" tubing such as your handlebar crossbrace (check your crossbrace to be sure) and gives you a threaded hole to mount accessories to. (The T comes from the name of the customer that first requested it.) The 4-bolt unit has an M6 tapped hole with 6mm of threads. The 4-bolt unit weighs 1.5 oz. I'm also working on a 2-bolt unit with an M5 tapped hole.
Ordering info:
| Part# TBLOCK, Tubing clamp block, $16 |