Your best shot at fitting a mirror in a tin, unless you are using the tin itsself as the mirror, or some aluminum tape on the tin, would be to get the REI Featherweight Mirror from REI.com and trim to fit.<br><br>The best source of button compasses are any of the small items such as zipper pulls, key chains, watch-band compasses, etc. that have button compasses built-in. Sometimes they are the Brunton brand, but others are as good or sometimes better. They come out easily, typically being held in by double-sided tape. You can pull them straight out with pliers. One particularly good one is 20 mm and comes in the "REI Mini Compass" key chain.