The Windshield Wiper Saga

This is the tale of the windshield wiper that would not be fixed. A while back, I noticed (as it was raining) that the windshield wiper on the driver's side was not performing at 100%, specifically in the area right in front of my face. Shortly afterwards, I purchased a new wiper, which my dad attempted to install only to find out that the Deathcab is not one to be easily persuaded into repair. It turns out that my windshield wipers are not the same as normal wipers (big surprise). After both of my parents attempted to switch the wipers, my dad finally resorted to switching out the rubber part. We assumed that the rubber was worn down, and therefore the problem.
It turns out that we were wrong, and the next time inclement weather came up I discovered that the wiper was still defunct right in front of my face. After some deliberation, I decided to turn to an outside source: my home teachers. This is how today my friend Jeff came to my house to fix the rebellious wiper. After waging war with said wiper for a good thirty minutes, Jeff was forced to admit defeat, or so we thought.
Shortly afterwards, my dad came home and decided to take another look at the wiper after I told him that I'd have to take it to the shop. After putting the wiper back together (the unruly rubber had given Jeff some trouble in re-assembling it) we decided to try it out just for the heck of it and, lo and behold, it worked! My theory is this: while attempting to detach the wiper, Jeff somehow adjusted the wiper and fixed it!
And there was much rejoicing....