Punto Engine Mounting Question

I have a question relating to a 1998 Punto 60SX (8valve engine).
I think that one or more of the engine mountings may either be loose or faulty. When pulling away from rest, especially with a cold engine, there
is a lot of "shudder", and I'm sure it's not the clutch, which was replaces a year ago. It is also sometimespossible to "sense" the engine moving when taking up the drive after changing gear, if you can understand what I mean.
The right hand mounting seems to have a problem, if I lever a screwdriver under the metal disc which sits under the large bolt, the engine can be moved vertically about one cm, which strikes me as excessive.
Is this a common problem?
My Haynes manual is poor, no pictures of the mountings. Is it feasible that the large nut and bolt (takes a 16mm socket) can work loose, I have tried to tighten it, and succeeded in tightening it a fraction, but not enough to lessen the movement.
Or is it more likely that the mounting is shot?
Thanks in advance for any advice.

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