3. Use Enough Lead
You need weight to get down 1,800 feet in strong current - lots of weight. Some daytime swordfish pros use sacrificial weights made of concrete to get deep, counting on them to break off when the fish bite. You have to rig this way when using hand-cranked gear, as you don't want to be fighting both a hefty swordfish and 10 to 15 pounds of weight on a manual reel.
But Dobbelaer rigs with the expectation of getting the lead back. The 30-foot dropper line clips onto the wind-on just past the mono-to-Dacron splice, held in place between two knots made of waxed thread and whipped onto the leader. When the angler gets the wind-on on the reel, simply unclip the dropper line and wind it up by hand. If you're unlucky and hang the lead in a rock far below, the section of light mono breaks and you lose only the lead.
These leads cost around $30 apiece, but the streamlined profile of the stick leads allows them to drop better than bulky concrete weights, with less flutter and therefore less chance of becoming tangled with the main line. The currents off Miami and Fort Lauderdale run much stronger than they do in the Florida Keys, the other daytime swordfishing hot spot, and you need to do everything within your power to keep your terminal tackle tangle-free.