Through no desire of my own I had to become a bit of a 951 person over the years... must have read the factory service manual 100x cover to cover + researched the years parts changed. I had 4 running skis with 951s and a spare 951 in my basement. Those were the days lol.
Then I got a boat and, again, through no actual desire had to become a Mercruiser 350 expert because the only way for me to have these toys is fix them myself...