1. Temporarily remove the moulded diffuser from the end of the Light Pipe.
2. Loosen the two sections of threaded collar at the same end of the Light Pipe by unscrewing two complete turns.
3. Push the collar down the Light Pipe by 7mm to make room for the drag weight and retighten to lock it into position.
4. To add several drag weights slide the collars further along the Light Pipe to create the additional space required. To fit two Drag Weights slide the collar 14mm, for three drag weights 21mm.
5. Slide the drag weight on and screw into the threaded collar.
6. Replace the moulded diffuser at the end of the Light Pipe. Your Optics Head or Mega Head can now be slid on and screwed to the Drag Weight.