Hm... I don't seem to have any problem with my Rolleiflex.

This actually, is one of my big pet-peeves with my SLRs... I keep thinking, "This is my most expensive filter, and I am handling it for every exposure I make" (or in the the case of my Cokin gel filter, "this is one of my most fragile filters and that waterfall is ruining my day! ")

Let us know what works for you.

Cheers,
Tom