The first step is to take a pair of cutters and snip
off about 2/3 of the eye. (The grid in the photos is ¼ inch.)
The second step is to use an emery board to round the
sharp edges left from step 1.
To use the tool, engage the "crotch" end onto the
hook bend. Push back slightly to disengage the hook
point. Pull the hook up snug against the tool and
remove the tool and hook from the fish's mouth.
If you've done a good job smoothing and rounding the
nubs, with many flies all you have to do is slide
the tool gently along the tippet and it will naturally
find the hook bend. The plastic has a molded in shape
that helps guard the hook point as you pull it out.
I used a braided loop and super glue to attach mine
to a zinger so it's always handy. I never go to gill
water without it.
Special thanks to Don Rolfson for edit and layout.