Found one entry of M 4-17, 27 years after Steve.
I noted a faint ring, which responded very well to the [OIII]. Details stands out not better with filter, so I decided to observe and sketch the PN without any filter. I did see some brighter ring sections, but no CS.

sketch: 27", 586x, NELM 586x, Seeing II-III
M4-17.jpg
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