Well, I will save you guys by making this one of my shorter long-winded speeches. But that being said, I will mention a couple things for you guys to consider…
First of all, if you ever go shopping for bearings, you will notice a good number of the aftermarket bearings that have some sort of centering configuration on the outer surface, already have the shields removed. That alone should give you at least a hint on which way is easier to clean a bearing.
There are no doubt, good points and bad points to considering when having or not having shields.
Realize, that even though a de-shielded bearing is easier to clean, Depending on what string type you use, it can get dirty faster also. If you’re using a type of string that generates a lot of fuzz, that debris can get ‘into’ the bearing that much easier. But then again, because you already have the shields removed, it only takes a minute here and there to get them clean and running again…
If you run a bearing dry and it has no shields on it, of course, it may make more noise because the sound that inherently is made by a bearing is not muffled So nothing stands in the way of that grinding noise being amplified.
If you have a de-shielded bearing, and you are ‘lube happy’ the lube is going to migrate out of the bearing and wick up your string and seep into your response pads. If you use a Petroleum-based lubricant, sometimes that can affect the performance of your response pads, and/or how well the adhesive holds the pads in. Most adhesives don’t like petroleum based lubes. ……This is just another aspect of yo-yo maintenance. But…by Keeping an eye on a lubed bearing situation can be difficult for some people that have this dim-witted belief that you should live in FEAR of unscrewing your yo-yo. That is about as bright as buying a new car and being afraid to lift up the hood to check the engine.
Shielded bearing usually do a pretty good job of keeping the lube ‘in’. But they also do a pretty good job of keeping the micro debris in, too. As a bearing ages(especially if you run it dry and leave the shields on, tiny bits of bearing balls and race fragments, stay inside the shielded bearing and conveniently assist the bearing in grinding itself to Death.
As, Examine suggested, an Exacto knife can be an excellent way to remove shields. But that being said, using an Exacto can also be an excellent way to Lower your blood pressure by slipping and running the razor edge across your fingers. No matter how advanced you are at throwing yo-yos around, that does not give you any bonus points in how to use razor sharp tools like a Boss.
Here is the bottom line…
If, you play bearing yo-yos but you mainly play ‘responsive’ keep your shields on because you can get more controlled, consistent ‘responsiveness’ by keeping the lube where you want it.
If you play primarily 1A, unresponsive, use no shield bearings and just be prepared to learn how to maintain them.
Over the years, I’ve had so many people tell me, ‘I have trouble maintaining my equipment because ‘I’m Lazy’. Lazy is ‘not’ a reason. lazy is an excuse.
Properly maintaining your equipment in any sport, hobby, pastime, is part of the deal. No matter whether it’s a surfboard or a skateboard or a handgun or archery gear or ….uh, yo-yos, to have functional equipment, you have to be part of the solution.
Personally, most 1A yo-yos I have are unshielded and seldom run dry. I normally try to keep a tiny amount of synthetic lube in the bearing to minimize the bearing from eating itself alive.
…Nothing wrong with running a bearing ‘dry’. There may be a price to pay for a shorter length of higher performance. But that is the price you pay for that performance.