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The knob


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Posted by Jeff Shaw on May 21, 2008 at 18:44:26:

In Reply to: Re: equalizing question posted by Walt on May 19, 2008 at 21:20:21:

I tried on the other day at the bob given memorial.

The knob right under the middle of the bottom of the glass pushes a butterfly shaped thing into the helmet that you press your nostrils onto.



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