depends on how you want it mounted, you can either do it how shartley mentioned. or if you use a foregrip, you can simply just use electrical tape, which will also help keep the wire in line too. There are also grips out there (And this depends on what type of remote switch/pigtail) you have) that have a mount built into them, so all you have to do is slide it in the slot provided.
There are many ways to do it, just depends on personal prefrence and comfort.

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