Why not have Soundsmith or one of the other services rebuild it for you.
I had them do a Sumiko Blue Point evo 3 with a broken cantilever and it sounded excellent. It's a lot cheaper than a new cartridge.
I think Soundsmith has the best deal for re-tips/rebuilds. Their top cartridges have great reviews and people do like them - you should be able to find something compatible with your Sumiko. The Hyperion ES Mk II, their top MI cartridge retails for $8k and the rebuild is only $850 to the original owner. That's hard to beat.
I prefer the offer of a fresh recently inspected new cartridge for a discounted price.
Audio Technica: I sent my AT33PTGII in to see if it's stylus was worn as I expected.
Yes, it is worn, we have a program to sell you a new cartridge for $_____
Half the price when purchased a few years prior.
Everything new, including fresh suspension which is often forgotten, recent inspection for output specs and truly straight/aligned cantilever/stylus tip.
Lyra rebuild Etna and Altas cartridges. Dynavector rebuild the XV-1s and XV-1t cartridges. They go back to Japan. It's more than a retip. You get all new internals, including dampers/suspension. Only the body and magnets are reused. For both brands the cartridges down the product line are exchanges.
For the moment... I thought you've missed one letter in your last word. For fee I guess almost all, but for free not to many :-) All you do is to give the core to get $50 for it of the trade-in value and get brand new one for full retail price maybe minus cup-o-coffee discount. The alternative company such as Soundsmith would probably make you wait a couple of months if not longer before your cartridge is back so prepare to get some "loaner" or temporary budget cartridge if you go that way and if they're still around. Everything does seem to be temporary even the members here and even me...
It's a matter of semantics. Which is to say that nearly all MC cartridge makers will supply you with a "new" cartridge for a fee that is darn near to the OEM cost of the cartridge. In some cases, the new cartridge may be your original one that has been truly rebuilt. In most other cases, the consensus seems to be that the maker simply exchanges your old cartridge for new. Call it what you will (except in the former case, you get back a cartridge with a used suspension, if that matters).