How to Fit a New Acrylic Watch Crystal
One of the advantages of acrylic crystals is that you can easily polish away scratches to make the crystal look like new again.
This is especially useful if your watch has the original signed crystal or a crystal that’s not easily available anymore.
It’s better to use the original parts if possible. However, sometimes the damage is just too severe. If the crystal is cracked or chipped, there’s no other solution than to fit a new crystal.
With this guide, you’ll learn how to easily fit a new acrylic crystal yourself.
Click here to learn how to fit a tension ring watch crystal with a crystal press.
The tools you’ll need
- Crystal lift
- Crystal lift base
- Digital vernier caliper
- Soft brush
- New crystal
Remove the old crystal
Take your crystal lift and make sure that the jaws are wider than the watch crystal.
Position the crystal lift over the crystal and tighten the jars until they’re gripping the side of the crystal.
Hold the watch case and try to lift the crystal. Tighten the crystal lift a little more if you can’t easily lift it.
Clean the inside of the bezel
This is the perfect time to clean the inside of the bezel to create the best fit possible for the new crystal.
Over time, dust and dirt build up between the crystal and the bezel. Use a soft brush and a hand pump to clean it.
Be careful not to damage the dial or the hands.
Measure the inside of the bezel
Use the vernier caliper to measure the inside of the watch bezel (make sure not to damage the dial).
The regular acrylic crystals are held in under tension so the crystal needs to be slightly bigger than the inside of the bezel.
Round off the measurement to the nearest even number and add 0.2 mm.
Let’s say you measure 29.76 mm. This is rounded off to 29.8 mm and then you add 0.2 mm.
The crystal that you need to use is 30.0.
I always order one size larger as well, just in case. This may come in handy, especially when the initial measurements are between two sizes.
Use the crystal base
Loosen the crystal base screw and open the sliding metal plates.
Place the new crystal in between and close the plates but not too tight. Screw down to secure the crystal.
Open the jaws of the crystal lift and place it over the crystal, resting on the metal plates.
Carefully tighten the crystal lift until it starts to grip the crystal. Check all around to see if you have an even grip.
Tighten the crystal lift a bit more because you need to compress the crystal enough to fit inside the bezel.
Fit the new crystal
Use the hand blower to remove all dust from the inside of the crystal and the dial. You don’t want to discover any dust after you’ve successfully fitted a new crystal.
Position the crystal lift with the crystal over the watch and lower it. The crystal should drop into the bezel, you may need to wiggle or rotate a bit.
If the crystal doesn’t drop into the bezel, tighten the crystal lift some more.
Keep a slight downward pressure on the crystal lift and slowly unscrew it. The glass will expand inside the bezel and secure itself.
Test the new crystal. You should fit one size larger if the crystal has too much slack.
If everything checks out…job well done!
Use a cloth to remove any fingerprints and keep rocking your awesome watch.