This thread was fun to work on, and the jack plate has worked perfectly for all these years. I will be moving this jack plate to another boat, and making another one for the Rhino boat, which will be sold. The new boat is a 14x48 Scandy white with a tunnel hull - it will want the adjustable jack plate. Since I have the Rhino sorted out, I will make the new one with the slots, but it will not have the screw adjustor.
Keep those tin boat projects going!!! :---)