This is a simple project that can be done in an afternoon.
I start with a length of walnut the size of my palm and thumb extended around 6 inches.
Next I cut a piece of 1/2 inch brass about the width of my thumb and file it round on one end. This will be for the business end of the opener. I drill a hole for a screw and countersink the hole.
I cut two depth cuts. The first one about an inch in and the second one is measured from the first cut to allow the brass to hang over a bit.
I split out the waste and pear down to the final depth. This method only works if you have very strait stock. Center the hardware on the blank and mark the hole with an awl or screwdriver.
A few finishing touches and its done.