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George made an excellent arguement against using metal knobs, which I 
advocated to reduce the likelyhood of rolling a valve shut. The point 
being the knob can be dented if sufficiently struck in such a way that 
the dent will interfere with the valve body and you will not be able to 
open or close the valve.  The tradeoffs are: a rolled-shut valve or not 
being able to shut the valve in the event of an emergency. 

The worst of the two IMHO is the latter as a rolled-shut valve can be 
easily dealt with. The valve can be reopened after you switched to your 
backup. I usually check my valve positions periodically during a dive 
when going through low areas anyways. A stuck valve is truely an 
emergency if you need to close it.

So does anyone want to buy a pair of brass knobs? Mine are for sale.

Thanks George,
Doug Chapman

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