We sailed a Pearson 39 yawl for 24 years before my present boat and I used to spend a lot of time each spring aligning the mizzen to the main, then making sure the mizzen had that fashionable slight rake aft. Then whenever I was in the dinghy I'd look for that view aft just to be sure they were still lined up. It seemed that no matter how carefully I marked the turnbuckles in the Fall when the sticks came out, everything was ever so slightly different in the Spring. This was also my phobia.