You have to define "best results". Does the originator of this phrase mean "fish catching ability" or that the product "looks most like the original"?
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Here's a couple of capes
If the alternative we're talking about is the plastic printed eyes, I think it qualifies in either category. I used them back in the 80's, and they had the nasty habit of turning streamers into spinning lures -- not very good for the leader, and I don't remember ever catching a fish on a fly tied with them.
There are other alternatives (at least for streamers) that work just as well for fish catching ability, such as painting eyes on the head.
I'm not sure there is any substitude for JC on a Letort style jassid, though.
Where did you purchase these capes?
They were purcasesd In Sackville Nova Scotia at a local fly fishing meeting
This may not answer your question - but it may give you another option - have you ever used starling as a jungle cock substitute?