hey you have to do a puzzle, go to a cavern next to the ''mart'' and you will have to move a box next to a cliff and get it next to the piles of boxes with a wrench floating and spinning
The cave was moved to be behind a tree next to the construction site, where you meet Mindy. Go through the cave and then keep going right until you see a box that you can push down and use to get ontop of the other boxes to get the wrench