Is there a particular guide to replacing the crystal to fit Sunnys? I'm in the UK and don't want to wait 3 months to send to wiz just to replace a crystal.. I'm assuming I need a crystal press..
It is very easy, yet not so easy.
Uncase the movement, I use winding position when removing the stem, Pop the old crystal out with your thumb. Leave gasket in. Add a very light coat of silicone grease on gasket, wipe off any excess. Insert new crystal as evenly as you can. Keep the press centered and tighten. You may need to release, check and move a smaller die around the edges. Make sure the die doesn't also press the insert.