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Bob and Patti,  The tungsten powder works very well and as you point out you
can fill in cavities with it.  Brent Regan points out that when mixed with
epoxy resin it's density is about the same as lead.  You can easily drill
into it.  You can get it at Exotech 954 960-1770 in Fla for about $12/lb.
My special thanks to Bob Young for supplying me with this information in
the past.  John Wright
Colorado Springs

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Please send your photos and drawings to marvkaye@olsusa.com.