We review the 'TWIN RELEASE' from Petzl. This is a twin sheave pulley designed to be part of a mechanical advantage system, but it has some amazing extra features when compared with you typical twin sheave pulley.
We run through all the features of this product and how to use it.
We also give you some great bonus info at the end of the video about 4:1 & 5:1 Mechanical advantages.

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