I wouldn't say I'm afraid of the mechanical stuff, but I prefer simplicity and ruggedness. There isn't much that can go wrong with a piece of cord that isn't obvious, and something like a ropewrench or hitchhiker is easy to comprehend and quickly inspect.
Not really an arborist supplier, but someone may have bought from cmc. They also look similar to RockExotica branded pulleys, and there may be similar issues?
PDF here...
https://www.cmcpro.com/wp-content/uploads/wd/recalls/30043X_ProSwival_Safety_Notice.pdf
Notice here...
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