I installed several of these nylon eyelets on all my kayaks, place them in different areas for tying down everything including rod leashes or crates, etc. I install them on the top of the rail or inner side just below the top of the rail if you want to keep the top of the kayak side rail clear for loading onto car/truck racks. They can be installed using stainless screws, washers and nuts. If access to install the inside washers and nuts is a problem then use Aluminum pop rivets, these from OEX will spread out in three directions on the inside without needing access inside the hull or using washers. The pop rivets are considerably less expensive than stainless steel hardware. I am including links to these parts on OEX online order site. All you need is a 1/8" drill and a pop rivet hand gun, they install super fast and won't corrode. Also included is a picture from a Malibu X13 that I used to have with a self made bait tank and attached using 1/4" bungee cord with nylon snap in ends and made to the length needed.
https://www.kayakfishingsupplies.com...ets-pack-of-10 https://www.kayakfishingsupplies.com...ets-pack-of-10