In article ,
Andy Hall wrote:
For the one that you have, there should be some strips of nylon with
castellations with it which you cut and place around the cut out
section. You should use them and not allow the cables to come into
direct contact with the cutouts.

My recently installed Crabtree Starbreaker didn't have any grommet strip.

I removed all the 'square' knockouts on the back I'd need, and carefully
cut a slightly undersized rectangle in the mounting board. I'd say this is
thick enough not to possibly damage the sheaths.

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Dave Plowman London SW
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