Watch Stems and Stem Extenders
When you fit a new watch movement into a case or retrofit a movement, you may need to convert the watch stem and make it longer. Since so many watchmakers have gone to retrofitting watch movements, stem kits are a key component to making retrofitting easier. These stem kits and stem extenders will allow you to change the diameter or tap size of the stem and will allow an old stem to fit a new crown. If your old stem broke you can make a quick repair by using an extender and you do not have to buy a genuine replacement watch part at a higher cost.