Welcome to the Beo-diction!

I'm up to eight Beograms at this point, both radial (3000, 1800, RX, RX2) and tangential (4002, two 8000s, TX2). The 8000 is the one I use the most often, though it's in need of repair work at the moment, so I've swapped the TX2 in its place. I like their sound quality, as well as their extreme resistance to outside vibrations (gotta love that inverted pendulum suspension!).
As for the cartridge issue, been there, done that. My RX2 came with a MMC5 cartridge where the cantilever had snapped in half, but the needle part was still there. After seeing other MMC5s go for over a hundred on eBay (I paid $5 for the RX2), I sent my busted MMC5 to Anthony Garza at the sadly-defunct BeoMuse repair shop. He was able to splint the cantilever back together, and the RX2 was back in business, albeit with a bit of sibilance.
Since then, I've managed to acquire other Beograms which had carts, though a few of them have failed due to the suspensions drying out (including the aforementioned MMC5). For the MMCx series Beograms, I have a MMC4 pulled from a defunct TX, as well as a NOS MMC5 which was fine last I checked. For the older Beograms, I have a MMC20E, as well as a SoundSmith SMMC20EN. I'll probably send one or more of these carts to be retipped at some point, or buy another SoundSmith cart (can't recommend them enough).
-Adam