sticky ball case openers
 

anyone used one of these before & are they effective ?

They work great with one very real limitation. If the watch has not been opened in years, or if the back is overly tight or corroded, they will not do it.

I use mine frequently. Very simple. Will not scratch. A good piece to have in your watch toolbox.

Mark

I have one. It won't open a caseback, although, it is good to unscrew the caseback once it's been opened.