That's the HJ-003 tongue with slot for .020" plectrum.
3/18/25. BREAKING NEWS: We have been working up an "aftermarket" tongue for the Hubbard jacks and now have in hand a nice prototype. We expect to have these available by June.
>> Also looking for 4-5 folk to Beta Test a few of these, please write me directly at gng@harpsichord.com.
...almost there.
Glenn
