I use copper shielding tape to tighten that gap if required.
Snail & Slug repellent tape from The Big Green Shed has exactly the same electrical properties as the much more expensive shielding tape, just narrower and more practical
Got a link to this product? I can't find it on their website...I presume it would be cheaper too
Thanks mate. Much cheaper than dedicated copper tape marketed for our desired purposes
Physically and electrically its the same as the dedicated stuff just not as wide and it solders nicely to tie it together, I've used it on a couple of guitars now