Reattaching Drain Rod to Trip Lever
By design,the Gerber brand bucket and wire assembly uses a direct connection between the upper wire and the hole in the trip lever, by simply feeding the wire loop through the hole.



Other brands commonly use a threaded yoke (for height adjustment) and cotter pin at that connection.

You will need to find a Gerber brand trip plate and lever (they are out there) or one designed for Gerber, or fix up a creative work-around with the one you bought.