There are some excellent Nikon lenses that lack the aperture ring to operate the diaphragm.

A normal adapter will not help us to use this lens properly on a Canon camera.
Our Nikon-Canon mount for Nikkor-G lenses includes a special lever to overcome this limitation.

The Nikon lenses have at least three equidistant screws, those are the ones we are going to use.

Take the one in front the lens scale center as a reference, the other two form a equilateral triangle with it.

First, check the screw length.

This lens uses the 5.5mm long screws

The one used for the Leitax mount has to be about 2mm longer.

We have to remove the three screws that form an equilateral triangle from the Nikon mount. 

and save them in the provided small bag.

Now place the Leitax intermediate  ring on top of the Nikon bayonet....

The sculpted recess of the ring goes near the aperture lever of the lens.

There is no need to remove the weatherproofing rubber ring of the G lenses, just help the Leitax ring to fit inside it with our plastic tool.

The plastic tool is also handy to adjust the ring position until the holes coincide.
Now we can use the three provided screws to securely attach the ring to the Nikkor lens.
And we are ready to put our special lever in its place, just on the left side of the lens lever.
Now put the Leitax mount on top of our ring.
The position is easily determined for the bayonet lock slot, it has to be near the opposite side of the G-lever.
Now attach  the bayonet to the ring with the provided small screws.
Our Leitax mount covers the Nikon bayonet with a flat black painted rim.
This avoids flares in our pictures.
Now the Nikon-G lenses  will be as solid as a Canon  lens on a Canon camera.
Another view.
It is very convenient to operate the iris with one hand and the zoom and focus rings of the lens with the other.
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How to glue a chip on your mount.