The music industry fills thin brass with lead, cerrobend, pitch (tar) or
ice. Ice is only used for a quick bend. I use pitch.

LB


" Doug Goncz " wrote in message
...
For experiments with bicycle lighting, I have in hand six engineering
sample
tubes, four of which are linear aperture in yellow. If I can get a clear
aperture tube, I intend to mask it with a brass sleeve, then add a lens.

I have a 5/16 steel die sinking mill.

I was thinking of filling the tube with plaster for support but will this
wear
my cutter, and will I be able to remove the plaster after milling?

We have available a self-cleaning oven, chisels, and can get muriatic
acid.

Oh, what am I saying? I should melt in some machinable wax, shouldn't I?

Ever hear of a quantum splitting phosphor? Two photons for the price of
one....


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