No need for hollow aluminum - just make your "singing rod" from Al bar stock. We have them in various lengths and thicknesses.
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"Gov. Perry. God here. The voice in your head is not me.
Take your meds.."
- sign @ St. Catherine's Episcopal Church
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Dr. George Spagna
Physics Department
Randolph-Macon College
P.O. Box 5005
Ashland, VA 23005-5505