PTP, you have elaborated the reason why I'm using the "brummel solution" (sounds kewl, don't it.) to having shackles. I'm pretty sure the line's strength isn't being exceeded.

I'm just curious as to whether there is a difference in the 'brummel solution' as I've outlined it and actually tying a knot.

Hell, I'm still not absolutely clear as to exactly why tying a knot reduces line strength in and of itself, but I take the experts' words for it. I mean, I'm not arguing that, I'm trying to understand why it is. It seems to me that tying a knot is just another form of braiding, unless the knot itself slips. I'm not really doing a good job of conveying the concept I have in mind...