I also got a #15D handpiece, and was trying to use it for
setting in a bezel and I can't seem to get a good finish with the
supplied anvil point.
The anvil points on #15's are meant more or less as blanks. At the
very least, the sharp edges should be broken or radiused on a
separating disc or grinding wheel and then cleaned up w' a Cratex or
rubberized wheel. A low doming will also help, but remember that too
high a dome or severe a rounded face is put on the point will lead to
a very deep set of hammer marks on your metal. The lower the dome,
the more the force is dispersed.
Even piers-- stone setters, ring benders, etc--need to be dressed
Take care, Andy Cooperman