Quote Originally Posted by fender3x View Post
If you don't think the tuners are snug enough you can wrap the shaft (B in the pic) with aluminum or copper tape (what you'd use for shielding). It's stiff and won't flex, so should work pretty well.

Click image for larger version. 

Name:	grover.jpg 
Views:	474 
Size:	21.5 KB 
ID:	45715

That said, I have some that are not that snug and don't rattle at all. When in tune, the string pulls the tuner snug against the wall of the hole, so it should not cause a rattle. The part of the tuner that does often rattle is the nut (A in the pic). I spent a couple of weeks looking for a rattle in my acoustic, only to discover that I just needed to tighten down the nut on the tuners.
Thanks,

it's good to at least eliminate something as a "possible cause".

I'll use the shielding tape in the second build - just to be sure though.