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

Click image for larger version. 

Name:	DSCF1205.jpg 
Views:	15 
Size:	678.8 KB 
ID:	74704

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:

Click image for larger version. 

Name:	DSCF1208.jpg 
Views:	21 
Size:	578.3 KB 
ID:	74705

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.