adamsgt
Jerry Adams
Yes, with one additional piece of information that the picture would not have shown you by itself. The three Allen head cap screws serve a dual function. Depending on which holes they are in they serve as jacking screws to slightly spread the female dovetail, to make it easier to get on and off of the base, and in their other position they are used to clamp the checker on the base. The rest of your observations were correct.
Ahh, thanks for that little tidbit. Not being able to see full on the end of the base I assumed the three screws held a side plate to secure the base to the action. Neat concept. Taking a better look at the picture I can now see the slit cut into the base to allow it to spread slightly. Well, I've got a full size mill (10 X 54 table) not getting much use now and this looks like an interesting project for it.