Dragging the edge of a rope

[Sanppy]

Hey there,

I'd like to be able to have the edge of a rope move as the user drags the mouse cursor.

I tried doing this with a blueprint but I had two issues:

1. The blueprint got permanently changed.
2. The effect wasn't visible in the game in real-time, instead it was just visible in the editor, and the next time I ran the game.

Am I missing something? Is there a better way?

Here's the relevant code segment: 

Code:

ObiWingedPoint point = rope.ropeBlueprint.path.points[0];
point.position = worldMousePosition;
rope.ropeBlueprint.path.points[0] = point;

Many thanks.