Yamaha key weights

C#4 in my YDP-223 is stuck (when you press it, there is a sensation of a stronger resistance, which goes away if you press it harder). I’m looking for the right hammer to replace it, but syntaur’s website shows several different weight options (weights #1 through #4). How can I tell which one to order?

Manufacturers usually stamp a number on the hammers to identify them. If you don’t see any, you can also look at the bend on the metal rod - It looks like each section has a different length of metal bent back to give it a different weight. That might be visible without removing it.