I was reading up on lapping chuck jaws and came across the thread
about using a brass bar and valve lapping compound to do the job. I
want to make sure I understand the process before I try it.

1) Get a brass rod 18" long and 1.25" in diameter. Face and center
drill both ends.

2) Put a dead center in the spindle and another in the tailstock.

3) Center both ends in the dead centers and turn a section long enough
to make sure that it is perfectly parallel to where the chuck jaws
would clamp onto it.

4) Tighten the jaws onto the brass bar to where you can barely turn
the rod by hand with the rod still being held between centers.

5) Using a screwdriver paste on some 320 grit valve grinding compound.
Turn on the lathe at one of its slowest speeds and grind the jaws
until the bar loosens up on the jaws.

6) Tighten the chuck jaws a little and grind again.

7) Grind until you can see grind marks all along each jaw.

Chuck up a drill blank of the same diameter you used to turn the jaws
and check for runout.

Is this correct?

Where do I get the adaptor to hold the dead center in the spindle?
Would it be possible to use a smaller lapping bar and use a collet to
hold the dead center with the draw bar and then just knock the collet
out after use using a knock bar though the spindle?

Thanks, Steve