I just revived a 2008 thread and made a search for other threads on topic (there are MANY!) and might as well copy some of the text here. It's regarding the 'newer' non adjustable Marzocchi forks.
http://www.ducatimonsterforum.org/index.php?topic=6916.new#new..................................
I'm a little ashamed that I haven't picked up on the one leg thing... (compression and rebound in one leg)
Before handing them over to my suspension guy I bounced the left leg all over my living room and was proud to have found the reason why my track riding damping felt soft/deep/jumpy. Obviously I was wrong.
To match my improved skills I bought better damping and more preload, both still in the same leg. (yes, I regret not getting adjustable forks from the start).
The point of this post is to show the pictures of the late 'non-adjustable' bottom and cap.
Also, to repeat that they can be tuned - at least if you're as stubborn and willing to waste money as I am.
Left leg castings: MA64 961
Right leg castings: MA65 960
Cap hex is 19mm
