I thought about trying to fit my retractable Cruzer drive, but upon further inspection, decided that it would be a huge challenge, plus I wanted to keep it original looking when closed. I happen to have a male - male USB cable that a friend gave me. This is why I went with the female USB connector here.
For this Instructable, I have already knocked out the laser side-cut key that went to my friend's new Beetle. I used a the key for my 1991 VW Golf and trimmed it to fit in this Flipkey.
Additionally, I was at a big box retailer and found a Kingston 4GB Micro SD w/ USB adapter. The USB was normally $25 - Marked down to $14.90. Add to that a $10 mail-in rebate - this whole project cost on the order of $5.00.
If you have to purchase the Flipkey or a USB, your costs will vary.
On with the Instructable.
Step 1: Getting the Pieces Together
Micro SD card with USB adapter - I used a Kingston MBLY/4GBKR
A male USB connector
A female USB connector
4 wires or 4-wire ribbon cable
Dremel tool - Very handy!
Low-Temp soldering iron and solder
Baking soda - Trust me on this!
Step 2: Getting Started
Use a pulling and bending motion to separate the two parts of the key.
Set the key half aside and open the electronics part. It is snap fitted together. The easiest way to get it apart is by using your two index fingers to pry it open where the tip of the key would rest when closed.
Once open, remove the electronics, battery, and battery clip.
Notice the tactile switches on the circuit board.... keepers?
Lift off the red rubber panic button and set it aside.