https://www.theropeaccesschannel.com
https://www.theropeaccesschannel.com/this-is-how-simple-pulley-systems-work-rope-access-rigging/#searchwp-modal-652ea0d21b1427a1bfa685e40d9bc1de
Product Overview: Harken Wingman
https://elevatedsafety.com/products/harken-wingman/?sku=IN404
https://www.spidertechsupplies.com.au/harken-wingman-haul-system
5:1 using 3 single pulleys