A "parking dolly" would be inserted under the nose and the nose landing gear retracted so the tail was raised.
The Bureau of Aeronautics liked the idea so much that it was a requirement for the next round of Navy carrier-based jets. Ironically, Grumman didn't receive a contract.
The North American FJ-1 Fury's approach was to stick the "kneeling dolly" into a socket in upper strut of the nose landing gear after opening an access door in the forward-facing nose gear door.
Don Hinton Photos
I'm not sure what the "guard" was for. It is too flimsy for protection from the arresting gear cables. My guess is that it was to keep the nose wheel from hanging up on something in the wheel well as it pivoted and unpivoted to lay flat. In any event, it appears to have been added after the surviving FJ-1s were assigned to the reserves.
The nose gear was then retracted using a hand pump.
Vought considered partially retracting the nose gear to kneel its Model 346A, which became the F7U-1 Cutlass, but decided that since it was tailless, overlapping its nose over the wing of the airplane in front was adequate.
The Banshee's kneeling capability continued in production for a while, as evidenced by this F2H-2N photo.
However, kneeling appears to have rarely, if ever, been utilized operationally and was not required of the next generation of carrier-based jets, including the Grumman F9F Panther.