Modify a bluerprint that goes from point A to point B so that he can go from point bo to point a

Development Programming & Scripting Blueprint
#1

Hi, I want mesh that goes from point A to point B Along a SplineActor.

By luck I found this marvelous blueprint that seem to work Out, This blueprint is long but this seem to be the part that make it move.

MovingForward.png
MovingForward.png1300×400 179 KB

For those who are curious, I find this one there Unreal Engine 4 : Follow Spline Path and Detect Point Interaction - YouTube

ok I tried to make several thing to make it revert mostly I revert the value(plus to minus, bigger than to lesser thant etc) so far with no luck here is my last attempt

MovingBackWard.png
MovingBackWard.png1300×400 186 KB

Either nothing happen and the item remain on his last position or the itemp flicker from begin to end

Any idea how to solve that, I feel I am close to the solution

Thanks