You’re less ignorant than me, that’s for sure. I neither design yoyos nor am an engineering student (although it should be stated: designing a yoyo doesn’t make you a physics master, and nor does being a student of a field make you all-knowing in that field… and that’s not a dig at you; I do think you’re more inclined to know more than me about physics and engineering in general!). There are CERTAINLY no apologies needed.
I should make it clear: it becomes a habit to present each post as a continuation of the previous ones; these are all observations based on what I think of as logical sense, but are not actually scientifically tested facts. It’s easy for me to say “No, the extra weight is ADDED, not moved, so spin time won’t decrease” when what is really meant is, “The extra weight is ADDED, not moved, so I can’t think of a logical reason that spin time would actually decrease. It makes sense to me that you’re actually still gaining spin time.”
It’s safe to assume that even when it sounds like I’m presenting facts, what I’m presenting are conclusions I’ve drawn from available information. They could still be refuted. When I present my conclusions this way, I’m actually prepared for and expecting evidence to the contrary that could make my point invalid.