Contact Andy Kim at:
http://www.phonocartridgeretipping.com/contact.html
His work is impeccable and for around $400 U.S. or 270 GBP he will install a new boron cantilever with microridge stylus (very similar to or quite possibly exactly what was originally on the Delos) and will also rebuild the suspension if necessary in that price.
I've had Peter Ledermaan at Soundsmith do a number of cartridges with ruby cantilevers for a little bit less than this with no suspension work (he doesn't do it) but am currently running an Ortofon MC 20 Super that I had Andy totally rebuild and retip with the boron/microridge mentioned above and it was a substantial improvement over the aluminum cantilever and FG that was originally on the cartridge. I would highly recommend him.
Turnaround time will be about 3-4 weeks.