The moco assmebly will be different to the one in the video above, as the spring is housed in the moco unit itself. The most likely cause of the sticking is dirt down inside the top cap on the ‘umbrella’ seal, or dirt under the blue spool dial on the outside of the fork.
To properly clean everything you’ll need to strip the MoCo which is relativly easy, have a look at the link below which will be a similar assembly apart from the return spring which is situated about half way down the silver shaft and Moco body take a visual reference on this before you remove the top cap off the MoCo unit itself.
Any problems drop me a mail.
Repair Leaking Pike Motion Control