A related site is Burch Popcorn Machine. Although not as complete as
this site, its goal is the same. Burch Manufacturing Company was the name
used until Manley changed its name in 1940.
Restoration Page for Models M-46 through M-49 Salt Dispenser
Photo by Erik Eggers showing components of the salt dispenser.
Forum Member ProVideoProductions suggests cutting the dispenser in half
to free a stuck plunger, the dispenser can then be MIG welded back together.
The following diagrams provided by ProVideoSolutions illustrates the
operation of the salt dispenser.