This thing sticks over the four trim buttons on the Jeti transmitters to make it easier to find the trim switches in flight. Use 4 round double-sided adhesive tape pads on the buttons and stick this on top. One for each joystick.
There are two different styles; the first one is the same shape as the part they remix from, whereas the second is a little fatter. Choose the one you prefer, and print two off.
Inspired by the original Thingiverse part, but made to better fit the styling of the transmitter and look like the expensive G-TRIM alternative (£40 per pair!)