Birth of the chain tube - ~20lbs 

2.5in under driver - 3.2in under engine - 520 

First year as chain tube lead - ~15lbs

2in under driver - 3in under engine - 415H Chain

3rd chain tube I designed

10.3lbs - 1.375in tall - 35H Chain

4th chain tube I designed 

7.6lbs - 1.25in tall - 35H Chain