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Author Message   Msiegel Tinkerer Username: Msiegel Post Number: 319 Registered: 03-2008 Rating: N/A Votes: 0 Posted on Friday, January 04, 2013 - 03:59 am:    The top one is not a vital part but replacing it will greatly reduce noise from the mirror when shooting and in the long run certainly help to reduce wear on the mirror and the mechanics. You might want to have a look at Jon Goodman's instructions on the ST 605 which cover replacing all light seals on that camera. Mirror damper included. You can find it here: https://kyp.hauslendale.com/classics/sealreplacement.html You will also find Jon's email there if you need to contact him. Best Martin