- Oct 9, 1999
- 72,636
- 47
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I remember seeing these in Popular Mechanics years ago, and it just popped in my head to see if they were still around and THEY ARE!! 
These things are just too cool and they actually WORK!:
http://www.conleyprecision.com/
These things are just too cool and they actually WORK!:
http://www.conleyprecision.com/