Hi Sam,  I just read your posting in the MMD 990223.  It might be a bit
complicated from the U.S., but you can get replicas of the pressure bar
for the Ariston as well as for the Aristonette from

  J & A. Blueml
  Achentalstr. 11
  D-83224 Grassau
  Germany
  Telefax: 49-8641-598964

It costs about DM 50.-, i.e. US$ 30.-

Greetings from Germany

Christian Greinacher