You can't see the commutator in your photos because of the angle at which they were taken. It's just a small part, about 3 inches in diameter, and about an inch thick. Go to https://www.thefordsonhouse.com/storefront.asp?subcat=189#189
to see a picture of this part.
I'm standing by my opinion of the purpose of those two studs at the front of the engine (i.e., being the remnants of a governor attach point). If you look at the manifold in the fifth photo of your last posting, in front of the #2 spark plug you'll see where the governor was attached to the manifold. Either it malfunctioned and was removed, or someone needed it worse than the current owner. (Which would explain the missing commutator linkage.) A governor is not essential, but it's a nice accessory if you are doing belt work; it saves the trouble of constantly adjusting the throttle. (This engine was designed to run at 1000 RPM, and no faster.)
The rest of the tractor looks great. Radiator looks good, the radiator sides are not cracked or broken, fenders are in great shape, and almost everything is there. The only other thing I see missing is the starting tank, which should be attached to the air washer (in the same pictured referenced above, look to the left of the manifold, behind the fuel line and below the air intake. The rectangular place with the two mounting ears is where the starting tank should be mounted. Most importantly, the manifold looks good, and seems complete. The manifold is a Holley 295, which is a later style, so that means the manifold was replaced sometime during the last 85 years. Also, the coil box looks to be the later style (but my memory fails me as to what year the change occurred). Replacement covers are available.
Have you looked up the serial number? It's stamped into the block just above the first manifold bolt, nearest the radiator. (You may need a small wire brush or a scraper to remove rust or grease.) A production matrix is available on this site. Serial Number List for FDS: Model F
-- Maine Fordson This post was edited by Maine Fordson at 06:13:24 08/21/10.