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When jigging I never use a swivel but I will use one on a Rap or buck shot jigging spoon.
Smallest black snap swivel I can find. Some lures I simply prefer to tie directly if lure equiped with a ring.FF
Ball bearing SPRO or equivalent swivel at least 18" up joining the braid to the fluorocarbon... then a tiny ball-bearing cross-lock snap to the lure .
Some lures require to tie direct for proper action, or a loop knot, it's my preference to never use a snap of any type unless the lure requires it
This minimizes or eliminates twist how, exactly... or you just don't think it matters
I tie small jigs and perch lures directly to the line with no swivel. Never get "line twist" with small jigs and live minnow while icefishing. Jigging spoons/lures... all those "Live Target" type operations will twist badly, and IMO a swivel somewhere along the system is nessisary.
I have 2 rods with the fireline ice on them and tried tying direct to the jig and found that I cant set the hook like I would with mono. It seems like I was ripping the jig out of the mouths all the time then I tried just lifting the rod in a slower motion not the big hookset and it works great. Only problem I found with the fireline is it seems to pull off the spool kind of funny. I have 8 lb fireline and think I might try around a 10 or 12 lb. I think the 8lb is to thin.
I also noticed that fish often check out the swivel. I now use about 1 inch of 30lb test atached to the swivel with a bare hook and a live minnow. Below i use 6 feet of floro with my jig. The bare hook and minnow often produces!
4-6 feet alows you to fish different depths. At chalet if I walk out iy is usually shallow so I may only have two feet between swivel and jig. At Balsam I may go as much as 6 feet if I am in 18 feet of water. And yes much like drop shotting.
At that point if the higher up I stop reeling and pull up by hand the old fashioned way. Give it a try you may be surprized!
(should have said) If the swivel and jig is higher up say 4 feet or more simply reel up to that point and then pull up by hand.
Very rarely will a good Sampo or Spro ball bearing fail.