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I found it a while back using a chart printed from Starry Night (and Argo Navis to get me close).
I have to say, it was pretty much at the edge of limiting madnitude in my sky even with the 20" - Well worth the effort though, just to say I found it!
My tips - get a finder chart with a FOV indicator printed on it to match your eyepiece so that you can match up the view exactly, and find the darkest site possible.
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