You install an aftermarket bezel on a GA-2100 by removing the strap, unscrewing and lifting off the original bezel, seating the new one, and refastening it evenly. It takes patience more than skill, and the main risks are stripped screws, lost parts and scratched stones.
Confirm the bezel fits first
A G-SHOCK bezel is made for one case shape only, so a DW-6900 or DW-5600 bezel will not fit a GA-2100. Before you order or open anything, read the model number engraved on the case back and make sure it says GA-2100.
Check what the listing includes, too. Most aftermarket bezels are sold as the bezel alone, without the watch, strap or installation, so you will be reusing your original parts and doing the work yourself.
Set up a clean workspace
The screws on a GA-2100 are tiny and easy to lose, so don't try this on a car seat or a tailgate. Work at a table under good light, on a soft cloth or tray with a raised edge to catch anything that rolls.
Gather your tools before you start so you are not hunting for them with parts loose on the table.
- Precision screwdriver that fits the screw heads exactly
- Spring bar tool or a thin pin for the strap
- Microfiber cloth to protect the case and crystal
- Small dish or magnetic tray for screws
- Soft brush or blower to clear debris
Remove the strap and old bezel
Start by taking off the strap, since it usually sits over or against the bezel edges. Push the spring bars or pins out carefully and set the strap aside with its hardware.
Next, remove the screws that hold the bezel to the case, turning slowly and keeping steady downward pressure so the heads do not strip. Do not confuse these with the case back screws that seal the module; leave the case back closed so you don't disturb the gasket that keeps water out. Once the bezel screws are out, lift the resin bezel straight off.
Seat and secure the new bezel
Wipe dust and lint from the case before fitting the new bezel, because debris trapped underneath can keep it from sitting flat. Line it up with the screw holes and the button openings, then press it down gently so it rests evenly on all sides.
Thread each screw in by hand first, then tighten them in a crisscross pattern a little at a time. Stop once they are snug; overtightening can strip threads in a brass or steel base. A stone-set piece such as the GA-2100 Two-Row Moissanite Bezel deserves extra care here, since a slipped screwdriver can knock against the settings.
Check your work before wearing it
Press every button to confirm none are blocked or stiff, and check that the bezel does not shift when you push on its edges. Reattach the strap, making sure each spring bar clicks fully into both holes.
A metal bezel adds weight and hard edges compared with the stock resin one. If you drive for work or handle tow straps and tools, consider how it will feel against a steering wheel or a glove cuff, and keep the original resin bezel and its screws so you can switch back for rough jobs.
- All buttons press and return normally
- No gaps between bezel and case
- Screws sit flush and tight
- Strap pins are fully seated
With the right screwdriver, a clean workspace and a slow, even approach, a GA-2100 bezel swap is a manageable home job. Keep the original parts stored together so the watch can return to its stock setup whenever you need it.