This rig gets its name from the ‘D’ shape of the hinge that the hair rigged bait is joined to. The D rig, as the blowback rig, allows independent movement of the hook from the bait. Usually formed with monofilament or a plastic coated hook-length, the would be ‘hair’ is doubled back and passed through the eye of the hook a second time after having an ‘O ring’ threaded. A naked flame will then form a ‘stop’ on the end of the original hair as the plastic material burns to a blob. This forms the ‘D’ part of the rig. A ‘hair rigged’ bait can then be attached to the ‘O’ ring allowing independent freedom of movement for the rigged bait. Another way of presenting a ‘Pop-Up’ but with independent movement of the hair. Usually used for ‘Pop Up’ presentation.