After buying a cheap hand brush from Home bargains ,I went about trimming the black bristles off the brush . Once a hole is drilled out in the normal way on the turret(British) these can be filled with a dab of superglue into the hole and then plugged with the new aeriel.
Hey presto you have a nice black aerial (which can be painted) and is fully flexible if caught accidently without drawing blood.
I am quite certain this method will work for you guys modelling in 28mm as well.
So far done 5 @ 20mm Cromwells with double aerials(A & B set ).
Trouble is I can't get of of the habit now of wiggling the aerials !

