Peke - crosslock swivels are the same as interlock swivels. You want BRAIDED nylon cord. Please go back to my post on what I use to build my jugs and follow the instructions and you will have a fine set of jugs that will provide you years of good service. The package says NYLON BRAIDED TWINE Size #48 should be available at BPS or Academy. This is tricky.... look for the word braided on the package. Size 48 has a strength of 260 lbs. It runs around $10.00 for 132 yds. Twisted nylon twine is 1/3 cheaper, spend the extra money and get braided only. You will not be sorry.
I use size 1/0 or 2/0 interlock swivels on my dropper lines and 3/0 barrel swivels on my main line. I tie all swivels with a palomar knot. I use 50# test Berkeley Big Game mono for my droppers.

These can be used on all Okla lakes. A person is allowed 20 jugs/person and your name and # must be on each jug. So you and your husband can run 40 jugs. I place the droppers 5' apart starting at the bottom and working up with the last swivel 5' from the surface.
Lake Eufaula is an excellant lake for jugging. Your juglines should be between 15' and 25' long for summertime jugging. These jugs are placed on the edge of the river or creek channel in those depths. 10' -12 footers work for winter jugging starting around 10/15 until 3/15. you get bigger fish during the winter.

If you have additional questions then send me a PM with your cell. You can caught a lot of catfish doing this and have fun doing it but it is work.