I don't like the idea of retipping for 3bills a nail that sold for 50 bucks back in the day. There are better options out there.
Joseph Long, needlestein banned and contented removed from ak,
cartridge_retipping-5 on ebay. Probably banned for in-thread advertising his services without being a vendor. He has a listing for these cartridges on the bay
Steve at VAS,
vas_cartridge_repairs on ebay,
Phono Cartridge Repair & Retipping Service | VAS Audio (vasnyinc.com)
Andy at phono cartridge retipping,
Services – PHONO CARTRIDGE REPAIR & RETIPPING. (phonocartridgeretipping.com)
Soundsmith.
All are spoken of as being good. I have heard difficulties with some of the Soundsmith work, one resolved, others (Bob's is one of these) not resolved.
Some can scrape the diamond of the cantilever and glue a new one in place. Some can rebuild the cartridge. Most like to replace the cantilever with a diamond attached. The idea of the micro-line being the one to get seems to be the general consensus, unless you need specific diamond for some reason.
There are others around the world. Getting diamond loaded cantilevers and affixing them to the old cartridge. Among other means of refreshing the cartridge.
For the price of a rebuild will the cartridge be better than an AT 540 which seems to be at about the price point of the bay listed option from Joseph. Is the Stanton or Pickering so good that a retip instead of a nice new cartridge isn't gonna be better? I leave that up to you to decide.
I'm saving my use of these guys for the LOMC nails I have that might one day need a refresh. Cheaper by far than replacing it. I'll be going to VAS first, probably driver over with a couple friends for the tour. Let him evaluate all my cartridges for wear when I drop off the ones needing work, the Shelter 501II, SEAC C3, Ortofon MC30Super and return with whatever I have left that is in good condition. I have a few that I know are in good enough shape, but a new viewing would be nice to have.