Just kicked my shiny new grand that came in todayUsed your method and instead opted for aluminum instead of brass. Picked up a small piece of aluminum bar from lowes: Shop The Hillman Group 1/2" OD x 6" x.016" Aluminum Bar Flat at Lowes.com
Took a while to find it in store, has several employees say they didn't carry it, but we found it in their parts bins (where their misc screws, washers, etc are). It was in one of the "hard to find" bins.
Also note, I tied it directly into the ground screw on the spring (drilled a small hole in the aluminum bar), so it makes a full contact with bottom plate of the spring.
Anyways picture time:
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I don't own or plan to own a kick. But just an observation here. Why not run the grounding metal up the opposite side of the battery? The metal strip between bottle and battery should offer support. If the grounding metal goes up past that metal strip it would hold the kick in place. I understand that some of these metals might be too thin to do this but just wondering if it might be possible.