Proper Way To Put Back The Case Back

[dvn]

Just open the caseback of my submariner to see the movement. Am i just put the caseback back or is there a proper wayt to do that? I notice the oring is very beaten up and very loose, where can i buy those caseback O ring?

thanks

[Logan]

Measure the diameter of the groove the 0-ring sits in, you can buy o-rings from any jewellers or watchmakers supply store.

To refit the case back properly you need a proper Rolex case back tool, its won't be tight enough without one.