Don Teach's detailed post has a lot of good info and is much
appreciated.  I've also been frustrated many times when installing 
new hammers, to find the bore hole angles are inaccurate, making it
impossible to do a perfect job.  I would very much like to bore my own
hammers, but have never found any sources that explain how.  

If Don could give more details about equipment needed, where to obtain
it, and how to do it, I would really appreciate it, and hopefully it
would help others on the MMD.

Larry Lobel
Virtuoso Piano Service