OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change

It worked amazingly, I was surprised how easily unscrewed the back of my both watches.

Worked great on a stubborn watch back. I saw a review video by a watch repair person that went over the various types of screw case back opening tools. Surprisingly these ball types came out near the top. What's good about these is there is no chance of scratching the case. This tool is for screw back cases only. Snap backs need a different type of wedge tool. When coupled with a case holding vise opening a screw back case is rather easy. It requires some effort and patience. Make sure the ball and case back are clean. No choice of color but I got blue.

Cheap and good

The ball arrived in a plain little box with two inflation needles and no instructions. Knowing the ideal inflation pressure would have been handy, although the small size of the ball makes hitting a precise number difficult. Even quickly yanking the needle out causes a little loss of air. The ball was inflated when it arrive, albeit a little squishy. After a few unsuccessful attempts to open several watches, I added some air to firm it up somewhat. On one watch, I managed to get the back cover to rotate a tiny bit. But I couldn't get it to keep going. The problem is that this friction ball relies on you pressing it very firmly against the back of the watch and rotating. If you don't have enough pressure, the ball slips and doesn't move the cover. I found myself really exerting a lot of force to prevent slippage. Even then, the cover didn't rotate. I gave up and ordered a proper kit with a case wrench and a bunch of other watch tools. My guess is that one could open some cases with this ball, but far from all. Inflating the ball to as firm a pressure as I could manage seemed to help its contact with the watch case.

I picked up this friction ball to help open the case back on one of my watches, but it didn’t end up working for my particular model. To be fair, it might not have been the right use case—the case back was probably too tight for a friction tool. That said, the ball feels well-made and grippy, so I can see it working fine on watches with easier-to-remove backs. Bottom line: Didn’t work for my watch, but seems like it could be useful depending on the watch and how tight the case is.

I just left a review for the more expensive Bergeon ball. My main criticism of that ball is that it is more expensive than what it used to be. This ball seems to be a bit thinner of rubber than the Bergeon ball, which makes it more flexible. The benefit is that you can shape it more easily as you squeeze it into the back of the watch case into whatever shape you need. The problem is that the thinness makes it give a little more if you’re trying to twist off a tight case when you need it to stay stiff instead of flexing. If you’ve ever opened a watch with a rubber ball, you’ll know what I’m talking about. It also may not last as long because of the thinness, but I think it will work just fine for most people. It also came with a pump needle, which the Bergeon ball did not! The Bergeon ball was also more flat, and this one was much more full. I’ll try to update my experiences as time goes on if anything changes.

This is what I should have bought first instead of one of those fancy case removal tools. Works great doesn't scratch up the back of a case pretty much works on any case back as long as it's not too tight. Would highly recommend it

Does what it is supposed to do and opened the 50-year-old Zenith with minimal effort, zero damage and no need for other tools.

perfect tool to add to my watch repair kit

all good

The product I received was fully deflated, and there is no way to inflate the ball. There are no instructions also about the same. Useless product, never buy

The item was so badly packaged that it was no longer a "ball" but a flat/collapsed contraption. The "ball" is not sticky enough to give good friction with the back case so only loosely tightened watch case backs can be opened.

It works perfect, I can't believe how easy it opened the watch ! I Definitely recommend it !