I looked through the reviews for the wall plate that I purchased (the one I linked to), and the very last review states- "Had trouble gettting this extender pair to work with my own network cables. Make sure that if you make your own cables that they are the same length and that each wire reaches the tip of the connector. Crimp tightly!".

The network cables simply plug into the back of the wall plate, so there's no crimping involved. Unless, when you say crimping, Ken, you mean plugged in securely?

Thanks for the help.

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