This 3D printed tool is a guide for making the holes on the back of the HB Racing wing.
If you struggled making the holes in a straight line before this will definitely help. As you can see in one of the pictures below, you place it over the back edge and then you use a 2mm drill to mark out the holes. Once you have the holes marked out you can either use a body reamer or a bigger drill to get them in the preferred size. Personally I like to use a body reamer after I have mine marked out.
Neat little tool which will keep your holes in a straight line and not being all crooked!