Three tools come up again and again once you start modding: the watch case opener, the case press, and the demagnetizer. Here's what each does, how to use it without damaging the watch, and when you'll reach for it.
Watch case opener (and case knife)
You can't mod a watch you can't open. A case knife pries off snap-on casebacks — set the blade in the lip notch and apply steady leverage. For screw-down backs you need a die-style case opener (or a friction ball for lighter backs) that grips the notches so you can unscrew the back without slipping and scratching the case. Go slow; a slip here is the most common way to mark a case.
Watch case press
A case press seats the caseback and crystal evenly using matched dies. Choose a die slightly smaller than the back for the bottom and one that matches the back on top, then apply firm, even pressure — never hammer. The press is what gives a clean, gasket-sealed close, which matters for water resistance. It's the partner tool to the opener and is on the essential list in our beginner tool kit.
Watch demagnetizer
If a mechanical watch suddenly runs very fast, it's often magnetised. A demagnetizer is a cheap ($10–15) device that fixes this in seconds: place the watch on it, press the button, and slowly lift the watch away while the field is active. It's worth owning even just as insurance, especially around speakers, magnetic clasps, and tablet covers.
Other bench tools
A loupe for inspection and an ultrasonic cleaner for cleaning parts round out a serious bench, but the opener, press, and demagnetiser are the three that solve the most common problems.
How they fit into a mod
A typical mod uses all three: open the watch (opener), do your dial/hands/movement work — see how to replace watch hands, dial and movement — close it cleanly (press), and demagnetise if the rate looks off afterward. Plan the build's look first in the 3D labs so the bench time goes toward parts you know you want.
