Paul,

In the article on your page concerning sealing the cavity around the
tube you mention small cavity and large cavity.  I thought there was
only one cavity.  What gets potted?  Thanks
Joe Berki
Limo EZ

The large is one side of the rotor housing and the small is on the other side.
You do both but one at a time. Best to get some junk rotor housings
and practice. There is a learning curve. Mazdatrix has junk rotor housings
for $35 each plus shipping suitable for this type of experimenting.