How to make a C.R.A.S.H. Space Store Front Music thwacker

As a member of CRASH space, I was asked to come up with a mechanical thwacker that would allow a solenoid controlled percussion "thwacking" against a makeshift instrument.

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.

This part may seem small, but this is actually the biggest part. For this instructable, you will need:

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)