I made this at TechShop www.techshop.ws
Step 1: Materials and Equipment
Laser cutter (my TechShop has a Trotec Speedy 300)
Drill with appropriately sized bit (matches spring diameter)
5 Minute epoxy
3" x 8" x 1/4" poplar board
14" long 1/8" diameter stainless steel rod
Spring from a retractable pen
This instructable assumes some basic familiarity with CorelDRAW and a laser cutter.
Step 2: Designing the Base
Make sure that you set the line width to hairline so that the laser cutter knows that you want to cut these lines and not just engrave them. I also use the convention here of red lines mean cut, and black images mean engrave (this information is used when setting up the laser cutter).