For what it's worth, and it's only my opinion (which, along with $1 will get you a soda out of a vending machine)... if you get to the point where you're throwing money at the Dual, perhaps you'd be best served to throw it instead at a different vintage turntable.
I mean, in their day they were regarded well, but I was just not very impressed at all with my 1019 when it did work. Now it does not, has a problem with a noise in the motor that's just plain annoying. At best, it's still an idler-wheel drive that relies on the mass of the platter to dampen vibration. Just about any mid-to-late 70's Japanese table will likely serve you better.
You already have a fine cartridge (assuming your stylus and cantilever are in good shape). Scour the local thrifts, rummage sales, craigslist, or if nothing else, ebay. For < $50, probably more like $25 or even less, you can do better.
I'm also assuming by your post that you're kind of new to this stuff. Trust me, the care and feeding of a Dual is not for the faint-of-heart or the newbie. Those wacky Germans have engineered it like a cuckoo-clock...it's not exactly easy to service. My Dual is sitting in the attic because a) I think I'd botch trying to fix it (and I'm pretty handy with this stuff), and b) I don't think its worth it, to me, to get it fixed and spend upwards of 100 bucks or more to do it.
But, it's your deal, Wade.