After getting all the parts cleaned on the ink fountain for my Thompson press, I painted the cover and the main casting. I was going to use semi-gloss black, but the flat black I tried seemed to have enough of a sheen to match the rest of the press, especially once it starts to get oily from handling. Then came time for reassembly, where I ran into a couple of glitches.
At this point I found that the ink adjusting screws were still not easy to turn. Evidently their holes were still clogged with a combination of dried ink and new paint. A tap could be used to clean the threads, but the thread was a 5/16BSF22, and old British thread size that you hardly ever see any more, especially outside of Britain! I spent a while on the web looking for such a tap at a reasonable price with no luck. Then I decided to try a possibly simpler task: find a 5/16BSF22 bolt and gash the end with my Dremel to form a crude tap that might not cut metal but would clean the threads. I went to the local hardware supplier’s catalog, found the page for BSF bolts, and right at the bottom they also listed BSF taps (I had already checked the tap & die section of their catalog and found nothing). So Spaenaur to the rescue: they had it in stock and it was only about $15.
Now that the adjusting screws were running freely, I re-installed the doctor blade. That left the cover to reinstall. It is held on by a short pivot pin on each end which is held to the cover by a cotter pin, and rotates freely in a matching hole in the main casting. But again the holes were slightly clogged with paint, and after fighting to put the pin in I had scratched it up enough with the pliers that it would not go in fully. Furthermore I determined that the holes for the cotter pin had been drilled a bit off-center and different on the two ends of the cover, so each pivot pin had to be re-installed in the same end of the cover it came from, and had to be rotated to the correct orientation to be able to insert the cotter pins. I filed down the burrs I had made on one pivot pin, finished assembling everything, and re-installed the fountain on the press.