Dai-ichi Seiko Tsuno Mat Place the Tsuno Mat on the boat's edge and secure the rubber part with a Lark Rod Holder (sold separately). The Lark Rod Holder will also be more firmly secured. When a squid is hooked, loosening the main line makes it easier for the squid to escape. Therefore, by reeling in the line while hooking the squid's hooks onto the Tsuno Mat, you can retrieve the rig without losing the squid, and furthermore, the next cast can be done quickly and easily.