I know some of the Eghemus hosts. You can bend the pill a little for an oval shape. It will hold by the host much better.
A little dent won't make a big difference but the pill will hold onto the host.
Or just glue a small section and leave a bigger area free for electrical contact.
Try spraying the surface with WD40, then scraping it to reveal the bare, non-oxidized aluminum which can be soldered to through the layer of WD40. (source)