From: null@void.com   
      
   The "angle-aluminum" with its "drop-down" from the "top" surface marks   
   down from that top surface.  This is a longitudinal mark.  It will   
   always "match-up" (?).   
      
   I am painfully aware that these best-meant descriptions, where you'd   
   want a sketch, can be impenetrable.   
      
   Best wishes,   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)