Jan 13, 2020 · Before you use a shackle, there are nine important rules to keep in mind. Download this Guide. Rule 1: When making a sling, attach multiple sling legs to the bow, not the pin. Attaching legs to the pin can damage and weaken the sling. Rule 2: When point loading shackle to shackle, connect bow to bow or bow to pin. Never connect pin to pin.