Instances of simple harmonic motion?

[szbxa]

Hi, I have this simple harmonic motion lab, it can't be a simple pendulum lab where you manipulate mass or length of string, it can't be a spring with hanging weight either, I really have no idea what to do, is there any other way to demonstrate simple harmonic motion?
thanks.

 

[rock.freak667]

I can't remember the name of the setup but you can essentially use something like a hacksaw blade, clamp it at one end (on the edge of a table), attach a mass to the other side and displace it.