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Mike,
do the whole tube. I use black felt, and bought it from a fabric supplier/drapery type place, in a roll a metre wide. The spary on idea that Ken suggests sounds good as well though.
In my cases I divide the tube into segments, with a spacer/light baffle at the join, and this spacer/baffle is effectively held insitu by the felt either side.
I have heard thought that baffles like this can be harmful to the tube currents.
Gary
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