If you have worn those shoes enough so the heel-tips need replacing, please, get some new tips. They are inexpensive, and will save your shoes. I recommend >> this << supplier. Very helpful.
A new metal tip is louder than a worn ferrule, in my experience. I have several pairs of new tips in my 'spares' box. If any are suitable, you can have some for the price of the postage? I have some metal ones too, but they are for a fairly thin heel. Let me know.