Fixing new keypad on frame
Fix new keypad on the frame. All edges of frame should be evenly covered by the keypad. Make sure that there are no bumps on edges of frame after keypad is fixed on it.
Final adjustment to frame
Frame has 4 plastic pins which gets deformed if its forcibly taken out of the key. You will be required to slightly reduce the diameter of this pins using a file before it can be fit back to the Flip key.
Finally fix the keypad
Finally fix the keypad by putting this keypad-frame combo on the Flip Key and pressing it gently with your thumb. If keypad is coming out from edge then slide it in using a blade. In the end check all the buttons for working.