I use a 3:1 with a single ratchet block on the low end. Works great. I release the ratchet some times to let myself down as it is a little jerky going down with the ratchet engaged. I have heard of very light people not being able to get down at all with the ratchet engaged. Personally, I would not want a ratchet block where I could not release it. I have heard of people using two ratchet blocks but the upper one is of the auto type, not the type with the little arm to release it.
Allen
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