Thanks for the compliments Stoker, as for the idea of getting it to cycle for demonstrations.....well, I can't see any practical way of using a motor, or even getting it to turn easily by hand, as it sits....
Actually, it WOULD turn fairly easily by hand for demonstrations, except for one problem. Since I was doing my best to restore it to some sort of running order, I assembled it using the correct graphite cord packing needed to seal the piston rods and the valve eccentric rods. That required installing the cord under pressure, in effect, with the pressure applied by the threaded brass "collars" there. That is the way it was made to work, but for this one, that packing just adds even more friction on top of an already imperfect engine. As it is, it will turn over, but requires using both hands applied to both sides of the crankshaft (with plenty of force). To change that, I would probably need to take most of it apart again (including the dreaded ball bearings). Then, it would turn far easier, but would also create a substantial pinching hazard (lots of ways to get fingers caught in this thing). So, for now it stays as it is (probably forever, as long as I have it)!
I wish I had a time machine to travel back to 1902, the guys who originally put them together at the Mason factory could fix it all quick. As I worked on this engine, it became obvious that these engines were probably made as much in the tradition of a "blacksmith" shop as by "machinists". I am guessing that the component parts were made and assembled in such a way that some fit with others, and some did not, and the builders had to develop skills to quickly determine which parts from the various bins would, together, make a working engine.
I will follow up soon with one last photo - showing all the bits that were left over when I was done (including the graphite cord). Cheers - G