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I'm of the opinion that I only need one if it's an iffy crotch. Nice, wide open crotches don't need a friction saver because the rope rides quite well without it. I look for a fork on a limb about the size of my wrist. So if you can't use them on the nasty, tight crotches where your rope won't...

That's what these are for. ;)

The standard micro pulleys like CMI with the bolt through the center are rated for 5000 lbs or more and are as strong as the bigger pulleys. I wouldn't trust the ones with the tiny rivet pin through the pulley axis for repeated use as life support (like the Fixe pulley) no matter what the rating.