I have moved west, and Dennis Cravens is just a couple miles away.  I
visited him recently.  In his lab he still has long term tests operating
with his spheres (of course, along with other experiments in progress).  He
said that he charged a HydroStik and then froze it at dry ice temperature.
 At this temp, the hydride is not releasing any hydrogen and he cut the
hydrostik open and added its contents to the sphere.  Dennis produces his
own hydrogen using a PEM generator and frequently works with an H2/D2 mix
that he produces by filling his PEM generator with the desired mix of light
and heavy water.

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