I made my own using 2 SAMPO ball bearing snap swivels with a split ring in between. They're a bit of a hassle to make but work great and last forever. The other double swivels always look cheap to me and cheap usually means prone to failure. Just my 2 cents.
Hope I can explain this right.First thing I do with any umbrella is to remove the center snap.Most are low quality.Like Fishing Frank I use a Sampo ball bearing 150 lb test swivel to attach the lure.Helps if you hook a "spinner".On the front of the umbrella I use a heavy split ring and attach a Sampo snap swivel.Clip one eye of the in-line here-the other eye goes to the snap swivel from the rod.With the heavy in line weight in front-you have a built in handle when leadering fish.Easy to change out weights. Skip