--- In
Homebrew_PCBs@yahoogroups.com, "cruizzer77" <atlantis7@g...>
wrote:
> Well this is interesting. The original patent paper clearly states
> that the etchant is pumped up the tube using a sprial mounted
inside
> the tube. This sounds reasonable to me but unfortunately will be
> close to impossible to fabricate such a spiral. Somebody who has at
> least a middle-sized lathe could probably try to turn it out of a
> plastic bar, similar to turning a thread. I think I'll try the 3-
> hole type next.
>
> Regards
> Martin
>
>
> Actually, sepending on the speed of the twists, or twists per inch,
one can take PVC and just twist it into shape like a wrought iron
railling spindle. Or, one could hand file a part without too much
difficulty.
Dave