I have a similar problem and thank you for showing the photo of your fix. I do have a question someone may be able to answer though.... Seeing Dutch 's photo of his filter, which is the same as my 1982 Plus 8, there is a standard, on mine a Ryco Z14, filter.
This filter, though, has threaded nuts on each end. Does this mean there is a rubber washer holding the nuts on, or an "o" ring. The nuts seem to be unremovable though, and , like Dutch, I will have to cut them off?