Double Double Uni Knot
Double-double Uni · Doubled Double Uni
Joining braided main line to a mono or fluorocarbon leader with two Uni knots slid together, the braid side tied with the line doubled.
Line-to-line · Intermediate · Braid / Monofilament / Fluorocarbon · 4 steps
ApplicationsHow to tie itFinished structure
No drawing of this exact knot yet. The written steps are the reference.
- Diagram in reviewA drawing of the Double Double Uni Knot itself is being made. Until then, follow the written steps.
Step 01
Double about 30 cm (12 in) of braid back on itself to make a 15 cm (6 in) double line, then lay the doubled braid alongside the end of the leader, the two ends pointing opposite ways.
No drawing of this exact knot yet. The written steps are the reference.
You should now seeTwo strands of braid lying together along the leader for about 15 cm (6 in), with the bend of the doubled braid pointing toward the leader's standing part.
If it goes wrongThe two braid strands drifting apart or twisting around each other, so later wraps go on as single strands. You see a gap open between them.
Fix: Pinch the doubled braid flat and run it between finger and thumb until both strands lie side by side, then lay it back along the leader.
Why: Every wrap in step 2 is made with both braid strands together, which is what separates this knot from a basic Double Uni.
- Diagram in reviewA drawing of the Double Double Uni Knot itself is being made. Until then, follow the written steps.
Step 02
Cross the end of the doubled braid back over itself to form a loop, pinching the crossing and the leader together. Pass the doubled end through the loop 8 times around both lines, then pull it to close the wraps.
No drawing of this exact knot yet. The written steps are the reference.
You should now seeA neat barrel of 8 doubled-braid wraps snugged down on the leader, each wrap showing two strands side by side.
If it goes wrongWraps crossing over each other, or the two braid strands splitting apart inside a wrap. The barrel looks lumpy and the strands show as separate turns.
Fix: Loosen the wraps by pushing them back toward the loop, straighten the doubled strands, and pull the doubled end again slowly.
Why: NetKnots closes this barrel onto the leader before starting the leader side. Once closed it holds its place while you tie the second knot.
- Diagram in reviewA drawing of the Double Double Uni Knot itself is being made. Until then, follow the written steps.
Step 03
Tie the same knot with the leader tag: form a loop back over both lines, pass the tag through it 5 or 6 times around both lines, and pull the tag to tighten. Use fewer wraps on heavier leader.
No drawing of this exact knot yet. The written steps are the reference.
You should now seeA second, shorter barrel of leader wraps closed down a short way from the braid barrel, with a little bare line between the two.
If it goes wrongLeaving a barrel only partly tightened. When the knots are pulled together the loose wraps slide unevenly and the tag can draw back through.
Fix: Pull each tag again until its wraps stop moving before sliding the knots together. If the leader wraps have crossed, undo that knot and tie it again.
Why: Heavy leader is stiff and does not bed down well over many turns, so the wrap count drops as the leader gets heavier.
- Diagram in reviewA drawing of the Double Double Uni Knot itself is being made. Until then, follow the written steps.
Step 04
Wet both knots and pull the leader and main line in opposite directions until the two barrels slide together. Trim the leader tag and both braid tags close.
No drawing of this exact knot yet. The written steps are the reference.
You should now seeThe two barrels butted against each other with no bare line between them, and short tags that do not catch when you run the join through your fingers.
If it goes wrongStopping with a gap between the barrels, or trimming the tags before the final pull. A gap shows as bare line between the two knots.
Fix: Wet the knots again and keep pulling steadily until they touch. If a barrel slides apart instead, cut the join off and tie it again.
Why: Pulled together, the two barrels jam against each other. Leaving the tags on until after this pull lets you see that neither knot has slipped.
Double Double Uni Knot — finished-state checks, on the shared reference layout
When this family fails, it fails as these. The recovered end still outranks the name.
A barrel that is formed, then slid to the eye or the other barrel.
- !Barrel locked short of the eye or the other Uni
- !Crossed wraps in the barrel
- !Tag buried back into the barrel instead of exiting
- !A knot left partly tightened, so its wraps slide unevenly and the tag draws back through
- !The two knots slide apart instead of meeting when the lines are pulled
- !Braid strands split inside the wraps, so the braid grips as a single strand
Too few wraps on the doubled-braid Uni
Slick braid walks
The extra braid wraps are why this is not a Double Uni · step 02
One Uni closed before the other
A hinge that clicks in the guides, then parts
Dress both barrels together so they butt · step 03
Braid not doubled through the barrel
That is the other Uni — not this join
Doubled braid through the whole barrel is the grip · step 01
Join clicks in the guides or one side walks
Check
- ?Doubled braid through the barrel
- ?Both barrels butted
Then
- →Retie with a real double
- →Trim after the seat
Finished check failed — One side single-line only
Check
- ?Both doubled sides form compact barrels
- ?Barrels meet squarely
- ?Tags exit cleanly
Then
- →Retie. Missing the double on one side creates an asymmetric weak join.
Too few wraps on the doubled-braid Uni
Check
- ?Slick braid walks
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
One Uni closed before the other
Check
- ?A hinge that clicks in the guides, then parts
- ?Inspect step 03
Then
- →Retie. Do not dress a defective structure and call it seated.
Braid not doubled through the barrel
Check
- ?That is the other Uni — not this join
- ?Inspect step 01
Then
- →Retie. Do not dress a defective structure and call it seated.
Same failure class, different geometry. Open the plates — Diagnose still starts from the symptom.
Not ideal for
- ×Micro guides that punish bulk
- ×When a slimmer Alberto or FG already seats