Originally Posted by JHannon
Well, by now I'm stoned like back in the Sixties.. using all these chemicals: ronson lighter fuel, Asahiklin, penetrating oil and -as you suggested WD-40.
But, I can proudly tell you that I did manage to loosen the Sandmar! (I did use a device we use here over in the Netherlands to forcebly unscrew fastened lids of f.i. jam-jars. I didn't damage the ring by using folded cardboard)
Now I just have to find out who -possibly with some WD 40 too- I will be able to loosen the focussing ring of the Sandmar: that's stuck too. Only the diaphragm ring works.
But, thanks for your advice to use WD-40 John, I did have it at home, in my barn to use for my bicycle. Just was too afraid to use it with my camera's!