[Premium-Rx] WJ HF-1000 Keyboard switches

[William Watson]

My WJ-HF1000 has a missing kHz button. I bought a set of the buttons several weeks ago but the new buttons are flat and mine are curved. The new button does not fit. The switch still funtions okay but the new button does not work. The plastic on the back of the new flat button does not reach down into the inside of the switch to reach the switch actuator.

Does anybody know about the flat vs curved key buttons?  I need to find a curved kHz button.
Thanks for any help.
JoeW5WBR