
After several wounds, giving up, not giving up, throwing my bike across the garden, trying again going through several new olives I have now become adept at this...
I found to remove yank it off using a set of pliers.
To install it again, bend it...you'd be surprised, if you gently and softly pry it open using first a screwdriver, then a set of needle nose pliers it will bend sufficiently to get it back on again.
Then use pliers to bend it back over the hose....even a hose mangled up from using crappy cable cutters.
There is a knack, and unfortunately I believe it's one that is only discovered through misery and perseverance...good luck!