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!