This clamp is designed to be mounted to 20x60 Aluminium t-slot style extrusion. Mounting holes are spaced 40x40 and work with M5x16 button head screws. The clamp will work with Routers or Spindles with a 65mm diameter body. The total height of the clamp is 60mm. The mount incorporates hexagonal nut traps for M5 nuts to aid assembly of the clamp. M5x35 screws will be long enough to secure the clamp to the mount. A Makita RT0700C Router/Trimmer is shown fitted. Photos are courtesy of a friend who is a little more advanced in his machine build than myself. Thanks to George for verifying the design. 22JUL14 - The mount part has been modified slightly to increase the contact surface on the 20x60 extrusion. 11DEC14 - Added mount part to suit 20x40 extrusion. Use M5x15 to attach to extrusion.