This is the Elmarit 90mm , one of the best in general opinion.
	It is a 3 cams model
	This model should be easy, but my unit has the diaphragm lever nose bigger than usual.
	We have to unscrew the bayonet first.
	And move the bayonet until the black shroud starts to pass up that nose.
	Now make some force with a pair of plastic tools.
	Slowly it goes up
	Almost free.
	Now we can finish the work with the fingers.
	Apart at least.
	After so much fight, the small ball remains in its place, I prefer to remove it and keep it in secure place.
	Now we have to unscrew the clear metal cams.
	The cams removed.
	Its time to replace the small ball and leave a little bit of special grease on it.
	Here is the small ball in its place.
	Install the Leica-Pentax or the Leica-Nikon bayonet, the red dot in front the scale center. The Leica-Nikon bayonet has the red dot slightly more to the right than the one at the picture.
	And this is the result, a Leica lens for a Pentax and Nikon cameras.
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