Strange, I can see the photo while I am in the "post a reply" window, but not after I've posted it!
Anyway, the clamp is not unlike the C clamp I finally settled on.
My motto is still a drop of olive oil on the piston rod (and cotter pins) once in a while, and never work the lever when dry.
The last time I "went inside" the group was two years ago, and it seems to be working fine.
I recently paired the PV with some Caffe Agust - a match made in heaven.
http://www.caffeagust.it/