Trigger Finger Grip
This is the Thumb on Top Grip modified by sliding the index finger forward along the lower side of the handle as if reaching for a trigger. This is also a superb grip for Wrist Casting and Arm Assisted Wrist Casting. Because the forefinger is more forward than with the standard Thumb on Top grip, the caster pinches the handle between the thumb on top and both the middle and forefinger on the bottom of the handle, giving an even more secure grip than the classic Thumb on Top. In addition, the middle bone of the forefinger rests against the side of the handle, giving the caster another touch point to which pressure can be applied to the handle. This is a very secure grip, and the one I use the most when Wrist Casting
The Trigger Finger Grip works well with full arm casting, too, but as with the Thumb on Top Grip, one must learn to control the wrist on the backstroke or the rod will arc too far back and produce an arcing cast rather than a cast with a loop.