Let's start at the beginning - I'm going to assume your legs come off in the same direction and that your running single coil.
2x 26gKA1, 3mmID,5.5 wrap is around .4 ohms
24g 3.5 wraps is +/-.17 ohms
Those are MASSIVELY different vapes. So, It's hard to tell what kind of vape experience your looking for, and if your running dual coil the 24g is bordering on dangerous with .085 ohms.
For the sake of argument lets go with the 26g single coil at 0.4 ohms. I suggest you familiarize yourself with
http://www.steam-engine.org/wirewiz.html (or another coil building tool) before delving into anything ... but there are some tricks you can use for quick numbers.
There are staples - Ribbon stacked together to make a rectangle and then clapton around them.
26g is easy since it sits right at .4mm. So 2 of them would be approx .4x.8. If you want to make a staple close to it just get some .4x.1 ribbon and make it 8 ply thick. The resistance will be a smidge lower at .38 since there is a little more wire vs a round core.
Example of a staple:
Framed staples - Ribbon stacked together, then round wire "framed" on the outside of the flat side of the ribbon.
This is where things will change a lot. Your going to have to drop the size of your round wire to accommodate the extra metal in the ribbon to achieve a similar resistance. To get ~.4 ohms you'll need a 3 ply ribbon stack of .3x.1 ribbon with 28g frames (.39 ohms)
Example of a framed staple, with the cores ready for fusing.
As far as swivels go ... make sure your getting ball bearing swivels. If you picked up barrel swivels then yah they are going to lock up BAD. Before I got a custom swivel I used cheaper ball bearing swivels from walmart. If you already have ball bearing swivels and they are still locking up then you will either have to put less tension on them, or get a higher test.