Hi, long-time lurker, first-time poster here.
I bought a used Hasselblad 503CW + 80 CF lens last year... unfortunately, the lens has a Hasselblad UV filter mounted on it that seems to be totally stuck. I can turn it a bit in each direction (about 3 cm at most) but it never quite keeps going and eventually "grinds" to a stop. I've tried a few ways to remove it (putting it in the freezer for a few minutes, using rubber gloves to twist the filter off), but to no avail. Is there anything else I can try myself before I give up and send it to a repair person?