I spent weeks researching this and fretting and asking people and came up with no satisfactory answers. I originally wanted to use a kellum (looks like finger handcuffs) but couldn't come up with a way to attach them. I ended up using cable clams at the exits and securing the wires externally with p-clips and I think they will work out very well.
If you have the option and can cut off the mast head so you can work inside you will have infinitely more flexibility and re-attaching it isn't that big a deal.
-p
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