Step 6.
Insert the Compression Spring into Geared Digits.
Remember you will need to do this twice!
Insert the Compression Spring into larger end of slot using a gentle, arcing motion while pushing / turning.

There should be a right and left Geared Digit, make sure both are completed.
Check:
The Compression Spring’s position.
Very Important: Be sure the Compression Spring is adjusted so it is away from the finger end.