You need a shackle that grips a bit deeper than the standard 4mm size but isn't overkill. This Jaycar D shackle runs a 5mm slotted pin with an 18mm throat. Tighten it down with a screwdriver or shackle key, pop in a drop of threadlocker, and it holds. Simple, sturdy, and it's $10.82 RRP
| brand | Jaycar |
| pin_diameter | 5mm |
| throat_depth | 18mm |
| shackle_type | D shackle, slotted screw |
| tightening_method | Screwdriver or shackle key |
| recommended_addition | Threadlocker for extra security |
| rrp_aud | 10.82 |
| category | Electronics & Components > Automotive & Outdoor Electronics |