Synthetic rope can jam between the pulley wheel and the side plate in the more common type of snatch blocks such as this one:
The best snatch block for synthetic rope is this type where, because of its design, the rope is less likely to slip between the pulley and a side plate:
Threoretically, with synthetic rope you could use a smaller diameter pulley but most snatch blocks are built to a size to suite steel cable.
Cheers
KarlB
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