<HTML>Ola, Paul, and Stephen The Bluthner specs also say that the hammers on the Patent Action rest on the rail.  If the blow is correct and the hammers are off the rail - then the rail covering needs attention.  I use the method that Stephen described.  I also agree with Stephen's comment above using the corect type of 'felt' for this. Uri gella aside! I have not found the 'L' shaped spring that easy to regulate.  I don't see how this spring can govern hammer height AND drop effectively? Regards Rob Thornton </HTML>