After getting my loose armrest off, I added a bracket that I fabricated
much like the windshield mount of a mirror on a Rabbit and others.
  So a wedge was attached to the chair, and a mating slot to the  arm.
Now I can pop off the passenger arm in a second for easier access to the
rear, and also to retighten those damn screws if necessary.
Will make and fax scetches if desired.
     Stan