Pin Dope

[allen@pengar.com]

I was called to tune a piano last week in which the pin block is so
bad that a slight jar of the pin by my hammer causes the pitch to
lower a couple of half-steps.  Hammering the pins doesn't help.  I've
never used pin dope, and I'm wondering if it would be worth trying as
a "last attempt"?  The piano is an old upright, and the family would
like to have it working for their child to practice on.   What tool
do I need to inject the liquid into the block?  Do I remove the pins
first, or just try to inject it in under pressure of some kind.
Every pin except the base notes will need it....

/Allen