Here is a photo of my Junk Pile Straight Key that I cobbled together in time for the Straight Key Sprint on January 1st.
I used a hunk of stainless steel strapping cut from a large size (5 inch) hose clamp. It cut pretty easy with a pair of snips but wouldn't drill worth a hoot, so rather than try to drill holes for the mounting screws, I wedged it between several screws and mounted it to a hunk of 3/4 inch plywood. One wire is jammed beneath the strap, and the other wire is connected to a screw below the ka-nob. You can see I even added a extra screw on the side to adjust the gap, HA HA!
The next photo shows my new key next to my set of paddles. A matched set!