Can't get sprocketed Singh-Ray into Cokin P type holder

I must be doing something wrong. I have a blue-and-gold Singh Ray in that sprocketed frame for Cokin P.

But there is no way to get that into my cheap Cokin P holder. The slot closest to the lens is a bit wider than the other slot but not enough by far.

I assumed the cheap holder isn't up to spec? What should I get?

I am not familiar with the Singh Ray but I do have sprocketed CPL filters for my Kokin P. If you look at your filter holder you will see there are slots for the filters - don't use these! If you look crefully there is another groove inside (closer to the lens) these slots - your filter fits in there.

johnf3f wrote in post #16501422
I am not familiar with the Singh Ray but I do have sprocketed CPL filters for my Kokin P. If you look at your filter holder you will see there are slots for the filters - don't use these! If you look crefully there is another groove inside (closer to the lens) these slots - your filter fits in there.

No, that's the one I'm trying to use.

I wonder whether mine is a Cokin Z, but the Blu'n'Gold isn't available for that. It almost fits but not actually.