Lapp on a bight
Japanese bondage nearly always uses a folded rope. When you are rigging it sometimes happens that you run out of line before you finish what you want to do. Use this knot to join the beginning of one folded rope to the end of another folded rope.
For the first step, treat each folded rope as if it were only a single line.
Make an overhand knot.
Open up the bunny ear of the line that you are adding in.
Pass the end of the other rope (that we are thinking of as being just one end) through the bunny ear.
This produces a knot structurally similar to a sheet bend. The nifty thing about this is that it dosen’t matter if you pass the end through the bunny ear the “wrong” way.
What would have happened if you brought the ends around in front?
Now when you pass the ends through the bunny ear it is going right to left instead of left to right the way it should be.
Don’t worry. When you pull on this knot to set it the bunny ear part will dip downward and under.
Continuing to tighten down, the bunny ear passes under the knot and up from behind. This creates the same knot as if you had passed the ends through the bunny ear the other way.