I would send it to Linn, unless you know who they send it to, and can guarantee that they will give you the same specs as they do for Linn. I don't know who they send them to. Troika is a very good cartridge.
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It costs about $600 the last time I checked. Basically, Linn will return you another (different) Troika that has already been rebuilt. You don't get back the your original one. I don't see it as a problem.
IMHO, a great deal. Since the lowest cost retip would be $3-400, and retipping is not equal to rebuilding.