We keep our 8.5t hard boat on a swing mooring, ours is a rope riser & we have two lines looped through the rope eye on the riser which we take one to either cleat on each side of the bow we loop the spliced eye under then over the cleat to prevent it jumping off. Most rented moorings you need to supply your own 'junk' which is the final attachment from riser to boat. Its the most critical piece of the jigsaw & you may be best having one made by a local rigger or mooring expert. I'm surprised that drawing posted shows a spring gate carabiner as we were advised these were a complete no no by the guy who maintains our mooring. They can flick off in a heartbeat if the boat is bouncing around, they will also damage the fibreglass if they come into contact on a regular basis. I worked in the sub sea oil industry & spring gate carabiners were banned from anything safety critical as they were a know hazzard. You can get locking gate clips just be very careful in your choice if you go down that route. Every boat & mooring is different, & requires slightly different equipment hence asking a specialist locally with relevant experience being the best option.
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