I recently bought a Proshade with various accessories, but don't know the use of one of them. Here it is :

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Second question : How do you mount your Proshade on your Hasselblad? I am not talking about the way to attach it to the camera, but where do you position the sliding guide bar? Often I see it placed under, but the way the instruction manual explains things, shouldn't the bar be on the left side like this:

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Which is more logical I think because it leaves more room to focus the lens with your right hand since CF lenses are designed for right-hand focussing. And the filter holder is easier to use since it open vertically.

Thanks for the help and apologies if it sounds like a dumb question.