KEN:
Thanks for the compliments, I did it with your help.
On the opposite side to the extinguisher, I mounted the epirb on a small pice of starboard to cover the opening.
I'll post some pics with the finished product.
Now, explain to me about the "fence" I didn't understand the concept, but to hold the extinguisher in place firmly i though about buying a spray can of foam and, covering the inner part of the extinguisher with nylon, spray the foam inbetween the ext. and the insert, creating a "cushion". When I'm done I migth have to order another insert from you(he,he,...). I'll let you know.
Lesterus