I don't even know if the eye-end of a finder is called an eyepiece but hopefully you know what I mean. My Mewlon's 7x50 finder has a very loose "eyepiece". It turns very freely and there's quite a bit of play in it if my eye makes contact with it; it wobbles.
It does focus and the views are as to be expected, but it just feels wrong. Perhaps a tiny bit of teflon grease?