Casing in my USB stick was broken. The easiest way was to throw it away... but I don't like 'easiest way'. I looked googled for a while but didn't found what I was looking for. So I decided to make my own casing.
It is quite ease (but not as ABC).
Step 1: What you need.
1. USB stick :)
2. Lego brick :)
3. Epoxy resin or silicon or liquid plastic.
4. Syringe with needle.
5. Small file or drill.