I've got a number of small 10.7 Mhx FM bandwidth crystal filters I
want to dismantle to recover the crystals for making a narrower
bandwidth filter.

What is the best way to open the can? I have a small butane torch
which I could use to try and melt the solder the joint around the
perimeter of the base of the can, but I don't want to harm the
crystals.

Does anyone have any experience of this, and would I perhaps be better
to hack the end off the can, and get into it that way.

Thanks de miken, zl1bnb