Hi All,  For those who are interested, I just posted a new web page
about sealing Kimball plastic block valves to the tiers.  It's at
http://www.player-care.com/kimball-block-valves.html

The technique also works quite well when doing individual block
replacement on-the-job.  And since the hot-glue conforms to irregular
shapes and spaces, it eliminates the need for the two mating surfaces
to be 100% clean or flat.

Musically,
John A Tuttle
Player-Care.com
Brick, New Jersey, USA