Help with cartridge

Sad to say it but you’ll have a hard time working with Needle Doctor (Minneapolis MN); the owner closed it last year due to poor health. I’m also pretty certain they didn’t do repairs or upgrades, just re-tip trade-ins. Perhaps you’re thinking of Soundsmith? They do re-tips and upgrades. Their boron/nude contact line diamond combo is $450.

FWIW, you might want to consider investing some extra $$$ and making a real upgrade. The Denon is a nice cartridge, but yours is rather old now and there are vastly superior carts out there brand new at the $900-$1200 price point.

Good luck and let us know what you decide to do.

Sorry, Needle Clinic (Andy), not Needle Doctor.

BTW
The Denon 103S in their literature is called "special elliptical"
but under inspection has more in common with other more complex
shapes than a typical Elliptical hence its original selling price.

Soundsmith may be great but has a very long turn around time. VAS turned around two carts for me in two weeks. He also has a very good reputation as well and is recommended in many threads.

https://vasnyinc.com/repair-service/
Billwojo

You can sell your broken Denon to people like VAS or some other re-tippers and buy yourself a much better cartridge for anything under $500 and it will be MM or MI, not MC 

If you want a decent MC then prepare to spend over $1k

If you want Denon you can find whatever model in 103 series under $350 in Mint condition or even new, including D, S or whatever index. All those cartridges are dirt cheap.