There are several main methods for threading a cored wire through a tee:
Simple version suitable for split tees with towers: First, remove the core of the cored wire, and then use two single knots to bite each other, which is the strongest. Finally, hide the knot in the tower so that it cannot be seen from the outside.
Method suitable for any type of tee: This solution is more hands-on and requires the skill of using a lighter to burn the rope head. The inner core is knotted and bitten to prevent breakage, while the outer ring requires more practice and slowly burns it until it is flat.
Two-lead threading method: Prepare two leads, one for making a coil and the other for threading. Bend the first lead into a coil and carefully thread it through the hole at the bottom of the tee all the way to the top. Then pick up the second lead and thread it through the other hole of the tee, with the goal of passing through the coil of the first lead. Gently pull the first lead to confirm whether the second wire has passed through. If it doesn't go through, adjust the position of the lower wire and try again. After the wire comes out of the other hole, pull the first lead wire and the wire will come out of the hole below the tee! Do the same for the other end.
