I borrowed the drawing and the general description of the splice from a post on an AllCoast Board. I've altered the description to reflect how I use the splice. It works well.
I use, approximately, a 36" Piece of the hollow spectra or dacron. (for 60# leader I use 130 # , for 80 # and 100 # I use 200 # hollow). The longer the hollow sleeve, the less frequent you will need to replace it. So using a little longer piece may be a good option as the leader gets an inch or two shorter each time you change your top shot...
Tip: Buy a set of hollow rigging needles. Makes this very easy (Melton’s sells them)
With your 36" hollow spectra or dacron. You will need to get a piece of thin single strand wire... You will bend it in half. Maybe 60 inches long, bent into a doubled 30" piece.
New tip: prior to running the wire, run the hollow needle through the entire sleeve to stretch it out slightly. This makes it a lot easier. Also wet the sleeve down with some water, once again it makes it a lot easier to do..
From the middle of the hollow spectra ( ~18" from the end) insert the bend in the wire into the hollow and thread towards the open end of the spectra until the bend emerges...
Slip a very small piece of your main line spectra into the loop. Withdraw the wire into the hollow sleeve pulling your main line along with it until the wire emerges from the sleeve. Pull your main line so it is completely inside the sleeve.
This is the difficult part.... Make a single over hand knot, and move the knot down to within 1/2 inch of the point where the sleeve ends. This will lock the mainline and the sleeve together. Pull VERY tight.
I will usually take a "sharpie" pen permanent black marker and mark the sleeve at the point in the middle of the sleeve where the main line spectra ends. You will be able to feel this point with your fingers..
For the mono end.....
First thing, you need to make your single over hand knot in the sleeve before you insert the mono...(do not tighten it down. You will slide this loose knot past the mid point of the sleeve. It will be moved to the end once the mono is inserted as described below.
I have found that the easiest way to insert the mono into the sleeve is with a hollow rigging needle (I bought a kit from Melton tackle) they have several sizes of needles for different sizes of mono).
If you don’t have a needle (get one…). You can do this without a needle by cutting the mono on an angle to form a point.You may want to get a small piece of fine grit sand paper to remove any burrs….
Tip: Before you insert the mono for the first time, wet the sleeve in water first as stated above.
You will then slowly feed the mono slowly inside the sleeve. This takes a little bit of practice. Getting the tip inserted is always the hardest part… You will sometimes have the mono hang up on loose threads in the spectra. That is why the needle works so well.. tip: move the sleeve onto the needle, do not push the needle into the sleeve.
When you reach the mid point of the sleeve (the point with the black mark), You will move the overhand knot to the end where the mono emerges. I tighten the overhand knot as close to the end as possible usually within a half of an inch, and pull TIGHT….
I also use a couple of drops of Line One or Plio bond adhesive at the point of the knot as an insurance policy.
You will now have a sleeve with an overhand knot at each end…. You are ready to fish….
To change your top shot, all you need to do is cut the sleeve at the knot by the mono, pull the mono out of the spectra and redo the mono end only…. So simple….It's a great splice with only the size of an overhand knot to go through the guides or rollers.
I hope this helps.
Jean