I used similar method with brush and pulling bristles(spelling?) out. but I carved around 6x6 mm channel in wooden holder and used hot gun to glue them in. I initially put plastic in channel, filled with bristles, 2,3 cm at a time. then I reinforced them from interior once again to be more firm in position. I don't have any picture on my hand here but can get them if anyone is interested.
Its pretty late here so please excuse my spelling...

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