I got a nasty surprise when I actually tested my tying of the RP knot. With 50# spectra and 40# mono, I got breakage at the knot with 20# of weight. I tried twice more with different line and careful tying but the result was pretty much the same. I watched the John Collins video twice more and it sure seems like I'm tying it correctly. I like the RPt's simplicity and small size but wonder about breaking strength. Is there something tricky that you need to do to get it right?