Toilet Flapper Chain Keyhole Lever Hook
This replaces the rusted or snapped wire hook between a toilet's flush lever arm and the flapper chain, so you don't have to buy a whole flapper kit. The 3 x 3 mm hook section fits through lever holes of 4.5 mm and up, with a 4.2 mm side throat for the lever web. Below it, a 16 x 34 mm paddle has three keyholes (5.2/4.2/3.4 mm entry, 2.0/1.6/1.3 mm slot) that lock small, medium or large ball chain, or a stainless link chain, at the slack you want.
bathroom toilet flapper-chain repair