I thought I'd just have a quick go to see how feasible it is to dismantle the can, using a dud example. I held it by the leads and slowly revolved it while applying the soldering iron to the rim of the can. I then braced the can on some newspaper with the iron, gently pulled, and voila!
As you can see, everything is encased in a blob of silicone grease.
I haven't gone any further, as I have errands to run, but I am quite chuffed to have got this far. It remains to be seen whether I have destroyed the thing or not.......
Tom
(Just can't resist trying this sort of thing)