Leica R Series Macro Extension Tube fitting problem

[stevegaskin]

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I've just acquired a Leica R Series Macro Extension Tube (type 14262 I believe), for the Elmar-R 100mm Macro. Whilst the adapter fits on the lens perfectly I can't get it to lock onto the body, it will only turn a small amount before it stops. Is this a fault or is there something I'm not doing correctly?   All the obvious indicators align, white dots,100mm engravings, but you will see from the attached photo's how different the position on the body is compared to the 50mm standard lens. Help please. 

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[tritentrue]

Try setting the aperture to f/22 before mounting the adapter on the camera.

[stevegaskin]

30 minutes ago, tritentrue said:

Try setting the aperture to f/22 before mounting the adapter on the camera.

Hi thanks. I tried this and f4 but makes no difference; it's hard to see what could be stopping it

[wizard]

I seem to remember that you should mount the adapter to the camera first, without the lens being attached to the adapter, and only then mount the lens to the adapter. It's worth a try ...

[stevegaskin]

Thanks everyone, all sorted now. One of the bayonet flanges on the mount was slightly twisted; a careful tweak with some pliers has solved the problem.