@drbond , Soundsmith is perfectly capable of doing a SOTA rebuild on just about any cartridge. It is safest to use the same type of stylus the cartridge was supplied with. If you change profiles even going for a more modern one, you can not be quite sure what will happen. If you are going to upgrade in the near future this is certainly the cheapest way to get back to playing records fast.
Linn does not make cartridges at all. Someone else does it for them and brands it as a Linn. Lots of companies do this. whart's Air Tight is actually a MySonicLab creation.