Here's what I came up with:
Disclaimer: CRASH Space, myself, and no one else in the world is responsible for what you do. Any damage or harm to others that stems from following this instructable is purely, entirely, completely, and totally your fault.
Not that anything would happen. Just sayin. That's why it's called a "disclaimer"
Step 1: Procure.
1x Steel Dowel Pin 3/32" Diameter, 5/8" Length
8x Pan Head Phillips Machine Screw 4-40 Thread, 7/16" Length
12x Pan Head Phillips Machine Screw 4-40 Thread, 3/8" Length
1x Pan Head Phillips Machine Screw 4-40 Thread, 1-1/8" Length
1x thwacker stick, preferably plastic, approx 14" in length, ~.40" diameter
1x solenoid, part number CII/A1464 available from Jameco Electronics
12"x12"x..220" thick acrylic plastic
12"x12"x.125" thick acrylic plastic
1x hair band (yes, really, a hair band)