Pen on Surface

In this exercise, you are given an assembly of a block with a wavy top surface, and a pen that is packaged (not fully constrained).

Your task is to modify the assembly so that the pen is fully constrained, with its axis always normal to the wavy surface no matter where the location of the pen's point will be.

tg2_anim.gif (1186339 bytes)
The assembly can be downloaded here:

horizontal rule