The Fishing Hobby
Member
You can use cheap pliers like these to pinch them. They don't have the ratchet mechanism, but it isn't necessary to have that, especially on these smaller clamps.
https://www.lowes.com/pd/Apollo-1-2-in-to-1-in-Poly-Pinch-Clamp-Tool/3723138
https://www.lowes.com/pd/Apollo-1-2-in-to-1-in-Poly-Pinch-Clamp-Tool/3723138