How to cast to the location of a separate Actor on an input event?

Trying to do that spline mesh thing, looked at your explanation on the first thread there. Tried to get it to work with what I’m doing but when I hit play nothing shows. What am I doing wrong?

EDIT: Hmm okay so actually I just was drawing the spline mesh too small, but I’ve gotta say it now looks pretty dooky. How should I go about making the spline mesh around the same size and color and such as the debug line?