Yesterday morning (Wednesday morning, since it's now Thursday as I type this):
Swapped the AI conversion ring from my somewhat beat up 50/2 Nikkor-H to a much cleaner specimen that I've had about as long as the beater. Also put a period correct prong onto the 200/4 Nikkor-Q which had the AI style prong on it, received when it got converted to AI. Later yesterday, I decided to figure out why the MD-2/MB-1 on my F2AS wasn't receiving power. Discovered that the contacts in one of the MS-1's were severely corroded. So much so, that the only way I could get them clean was to take a screwdriver and scrape the crud off. Works much better now.