The SK7 has been manufactured in two versions AFAIK. The earlier version used a white friction Ring and Rotating Bezel could be removed from the Friction Ring. I'll call this the "older" version
The "Current" version uses a black friction ring, and the bezel cannot be removed from the friction ring.
The basic sealed compass is the same.
This has caused a great deal of confusion regarding replacement parts.
I have never been able to get a clear picture of what Suunto's intentions are. My beliefs are that Suunto has discontinued the "Older" version, and replacement Bezels and or white friction Rings are no longer available. This leads some dealers to say you can't buy a replacement.
The Current black friction ring and bezel apparently are available, but only as an assembly. This maybe the source of the "one time fit" that has been noted in this thread.
DSS currently produces a SK7 boot that will work with either the older white friction ring, or the newer Black Friction ring. If you have an older DSS Boot that accomodated only the white friction ring, and you need to use a current black ring please send me an email,
info@deepseasupply.com
Please note: DSS is not an Aqualung Dealer, and cannot supply Suunto parts.
Regards,
Tobin George