Physics constraint: How can I reduce minimum distance?

Hello,
I am trying to implement a grappling hook in a 2d platformer game similar to the one in Trine
(Trine 2: Thief Tutorial Gameplay - YouTube).
So far I’ve been able to implement grappling, swinging and increasing distance to the point
where the hook is anchored.
I use a physics constraint to preserve the distance between the player character and the anchor point
which can be increased by increasing the linear limit but it does not work to decrease the distance below
the distance at the time, I connect the player character to the joint.
It seems, that this distance is regarded as limit 0 and reducing limit to a negative value does not further
decrease the distance.

Is there a way to decrease this minimum distance?

Sorry you never got an answer to this. In the current version of UE (4.22) the physics constraint component has a built in motor/drive function that you can use to move up and down your limit.

could you explain a bit more please? i’m trying to change distance between the character and the hook at runtime