VDC (vdctrading.com) will make up any configuration for you if you want to save yourself a
lot of soldering! Alternatively Studiospares have all the bits you will need. I have used
the Sommer multicore cable and its pretty decent for the price.
In terms of
filling the hole you could just mortar it in. Or use a flexible sealant if the gaps are
minimal.
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http://www.theregularjoes.com
http://www.kmusic.co.uk/the-regular-joes/