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

I got a yellow ball and after maybe two tries I was able to unscrew all the watch backs I had with no scratches. It was also all I needed to replace the backs and screw them securely.The ball came inflated and is made of a thick material, it also came with a needle to reinflate the ball if it goes flat but I didn't have to use that.It does leave a bit of residue on your watches but this easily cleans offFor $5 you can't beat it.

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.

I've seen these at watch shops and was curious if they really worked.WOW...It does! was able to remove watch and pocket watch backs that seems really hard to open.So easy to use!...an adult could even do it!Press and twist to open or close...better than by hand. Cuts down the possibility of cross threading.

Terrible product, does not function at all. The ball just keeps slipping and I can' get it to open my watch. I am pretty sure I am using it the way the right way so I think it's just poor quality product.

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.

Performed as advertised and expected. Quality feels poor but was good enough to get into my watch. But nothing to really rave about. probably not any better or worse than all of the other dozens of similar products

Works good especially for the price. You have to give it some good pressure to loosen the case-back, but overall good product.

Ease of use:It actually worked on several of my watches. Didn’t even have to remove the bands as ball contorts into different shapes.