There’s a new design for RH levers! Dave Kolacny has a lever that’s simpler to use, has only soft parts, and works on all major types of lever harps.
It can only be used to raise the string a 1/2 step. The LH is needed to lower it again, but this configuration is specifically what’s needed for Suzuki Harp books 2 and 3. (Only 1 lever is needed.)
They are available from KolacnyMusic.com, 1-800-870-3167.