I learned a valuable lesson from this experience. I now have a new customer. I also know that 40, 38, and 357 shells are heavier and don't make the best post/stud earrings. As a result, OTGTG Bullets and Bling will begin using the hypo allergenic clutch post on the backs of those earrings for the customers who do not want/like dangles. We are also going to start using the slivers in our designs of posts for the heavier casing calibers. Thank you to our customers for the feedback and to help us make a better product.
The first pic is the older model that weigh the ears down. The second and third pic show a sliver in a "cup" and a sliver on a flat base.