Opening Any Caseback: Tool Selection Map
Author: Funny Items
Release time: 2026-08-25 18:52:09
View number: 13
Caseback Openers: Which Tool Opens Which Back
Every build starts by getting inside. Using the wrong opener is how slip-ruined casebacks and bloody knuckles happen. Match the tool to the back type — here's the full map.
The Four Caseback Types
| Type | Identified By | Tool Needed |
|---|---|---|
| Screw-down, notched | Six slots or square notches around the edge | Adjustable case wrench (jaxa-type pins) |
| Screw-down, knurled | Coin-edge ridges all around | Rubber friction ball or case wrench with smooth jaws |
| Snap-on | Smooth rim with a tiny pry lip/gap | Case knife or snap-back pryer |
| Screws (individual) | Four to eight small screws on a plate | Precision screwdriver, correct blade size exactly |
Technique Per Type
- Jaxa wrench: set pins into opposing slots, press inward pressure while turning counterclockwise. Inward pressure prevents pin slip-out — the scratch mechanism. Work on a rubber mat, caseback up
- Rubber ball: genuinely underrated — press firmly against a clean knurled back and twist. Zero scratch risk. Fails only on overtightened backs
- Case knife: find the pry lip, push and twist gently. Protect the crystal side; never lever against a rotating bezel
- Screw-down plates: exact-fit driver, firm downward force while turning — cam-out strips heads instantly
Overtightened Back Rescue
- A few drops of penetrating oil at the seam edge (keep off gasket area), wait ten minutes
- Rubber ball for grip plus a strap-wrench for torque
- Last resort: bench vise holding the caseback in soft jaws while turning the case body
Before You Close Up Again
New gasket every time — no exceptions per our water resistance rules. Threads get a hair of silicone grease so next opening is easy.
Frequently Asked Questions
Is a cheap jaxa wrench fine?
For occasional use yes; just check pin tips are smooth. Burred pins chew slot corners.
My back has both slots AND a pry lip.
It's screw-down with an emergency lip. Use the proper wrench route first.
Can I open without any tools?
Only knurled backs via rubber ball improvisation (jar lid gripper). Snap backs need a real knife tool.