Tool for opening screw-back watch cases. Designed for watchmakers and home repair of mechanical, automatic and quartz watches.
Professional screw-back case opener kit for round screw-down watch cases. This adjustable tool fits virtually every Rolex Oyster-style, Omega Seamaster, Seiko diver and Tissot screw case back from 18 to 60 mm and lets the watchmaker open the case cleanly without scarring the steel.
Opening a screw-down case back without scratching the polished surfaces or shearing the case-back ribs is the first skill of any serious watchmaker. This adjustable opener provides three rotating gripper pins, a precision lead screw and a knurled top knob that translates manual torque into a controlled rotational force on the case back. Combined with a watch holder, it gives the operator the static counter-force required to unscrew even seized backs that have been over-torqued or sealed for years by aged grease, dried Moebius 8217 or contaminated gaskets.
Use this opener whenever a screw-down case back has to be removed for battery change, full service, case-back gasket replacement, crown gasket inspection or crystal gasket renewal. Pair it with a watch-case holder to keep the watch immobilised; never open a screw-back by holding the case in bare hands.
Hardened steel pins, chromed body, machined precision lead screw. The tool ships in a protective case with a complete pin set. Origin: European professional watch-tool standard.
Does it work on Rolex? Yes, the round-pin profile matches Rolex Oyster case-back ribs.
Can I use it without a case holder? No, you risk slipping and gouging the case.
What pressure rating must I respect after closing? Down to 10 ATM if the case-back gasket is in good condition and lightly greased with Moebius 8217.
Beyond the immediate operation, this tool fits into a complete watchmaking workflow: it pairs with a digital caliper for measuring the case-back groove, with a stock of NBR, FKM/Viton, EPDM and Hytrel gaskets in calibrated thicknesses from 0.30 to 1.20 mm, and with Moebius 8217 silicone grease used by every Rolex, Omega and Seiko service centre worldwide. Used carefully, on softly padded surfaces, with the right pin set selected and the case holder firmly closed on the watch, it preserves the original Genevan polish of the case and avoids the famous "slipped tool" scratch that ruins an otherwise immaculate restoration. Maintenance is minimal: a drop of light oil on the lead screw thread every fifty operations, occasional cleaning of the gripper pins with isopropyl alcohol, and storage in the dust-protected case will keep it accurate for decades.
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Snap-on case-back opening tool for watches. Designed for watchmakers and home repair of mechanical, automatic and quartz watches.
Tool for opening screw-back watch cases. Designed for watchmakers and home repair of mechanical, automatic and quartz watches.
