c150 rudder stop AD

Can anyone describe the way the rudder stop mod on Cessna 150s
should look? I went to rent a 150 and the way the AD was
incorporated didn't look right so I passed on the flight. The
stops were attached to the rudder horn (? the curved metal
portion) by drilling three holes and riveting the stops to the
horn. It looked brutal, but I don't know how it should look. I
was concerned that such a small metal horn had been drilled into
in terms of lost strength. Any insight would be appreciated.

Brendan