rileynp· Super Moderator
The assembly of this case is not straight-forward, and I can see many potential pitfalls awaiting someone who is not familiar with the construction as force must be used to disassemble and reassemble the case.thscott said:I received the replacement crystal from CousinsUK. It looks to be exactly what I need. I was not able to locate or purchase any gaskets. I am ready to have the crystal installed. Can I take it to any good watch repair person near where I live, or do you recommend I send it to a Seiko authorized repair shop? I'd prefer not to ship it anywhere. Is it as simple as removing the bezel and installing the new crystal? Is the crystal glued in? Can the crystal be replaced without installing a new gasket seal?
There is no glue involved, rather the crystal is installed into the bezel from the inside, but only after the bezel is removed from the case. One cannot pry the bezel out, it must be pushed out from the inside (which requires exactly the right sized dies). Both a rubber crystal gasket and a plastic bezel gasket are disturbed during this process and should be replaced to ensure water resistance. If one is lucky the watch can go back together using the old gaskets, but they necessarily won't be doing as good a job of holding things together as new, unused gaskets. If one is unlucky, the gaskets (particularly the plastic bezel gasket) will be deformed from the process enough that it won't allow proper seating of the bezel in the case. I'd take it to the best watchmaker you can find and who is willing to take on a potentially risky replacement like this. If they don't know the risks involved, that likely means they aren't familar with this "inside out" system, maybe find some one who is.
4823-8039 crystal gasket: DJ2990B
4823-8039 bezel gasket: 89997850
4823-8039 back gasket: DB2915B
4823-8039 crown gasket: DJ0060B
4823-8039 cell hatch gasket: EH1175B