Thoughts on the Plaubel Makina 67

Hello again everyone!
I have just purchased a 58 mm B+W 007 Clear Filter to protect the front element from the elements. When using the Makina 670 with BW film, I would like to use the B+W 022 Basic Yellow Filter instead. I have one with 72 mm diameter. My idea is to purchase a step-up ring from 58 mm to 72 mm.

Have you ever screwed wide step-up rings into the 58 mm thread of the lens? Any risk scratching the flat surface ring around the front element?

Thanks,
Erik
 
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