Paperclip.
Does more than just hold a few sheets of paper together. Why, this amazing device, when bent into various configurations and applied logically to the task, will do the job of bolding the heat sink in place. It's removable, re useable and real cheap. They also come rubber coated in several flashy colors. So don't get all stuck together with sticky messy glues. Secure it with a hunk of wire.
:-D
