Too much hard-water hardware
A common question I hear at seminars is whether anglers should avoid using swivels snaps and weights.
My answer as it pertains to ice-fishing is yes, too much hardware under the hard water won't help your success. More than open water, ice fishing is all about finesse.
As much as we try, no lure can perfectly mimic a natural food source. Many come close, but adding swivels and weights further detracts from that lure's attempt to present natural movement.
More metal mostly affects the fall of the lure, and it frankly makes the whole thing look gaudy. Learn your knots and to quickly tie directly onto your ice lures, even in cold weather. Light line combined with tying direct will give that lure the most natural downward cadence.
So many times, I'll see anglers use a No. 12 ice lure, which by design takes a while to drop through the water column. They want to accelerate that, so they add a split shot. That's a no-no!
You need that slow fall to mimic tiny food sources, folks. The lure manufacturer built the lure that way for a reason: to trigger sunfish and crappie bites.
Patience is a virtue, especially in the world of fishing, and doubly especially in the world of ice-fishing. If you insist on a faster drop, increase the size of your ice lure, but don't add a split shot. You're completely altering the performance of the lure.