Examining slippage of bends: Lapp, Sheet, Double Sheet, Simple Simon Under

[Seaworthy]

This post prompted me to check out the Lapp bend (or knot as it is also referred to):

Referring to the double sheet bend, Don Lehman recently made this interesting comment that caught my attention. I had not come across the Lapp knot previously:

@Dan_Lehman post:7

Discard them both!
Try this similar knot, intead:
looking at #488, follow the path of the
thinner (hitching) line from the tail
through the knot --it reaches across the
bight (not through it),
turns around it fully,
then turns around again but is tucked through
the bight.
So, with this vision, tie $488 in reverse
(tails are SParts & vice versa --which keeps the
“same side” relationship (tail & tail, SPart & SPart)).
BUT on both turns around the bight, tuck the
working end (of thinner line, in your example)
through the bight (otherwise, you’ll have a jamming
knot!). You might even make another turn,
and the tail can be further tucked out through
its own initial turn around the bight.
(If the diameters are much different, this becomes
problematic to secure, as the large-roped bight will
see too much space for the small hitching line to
be nipped.)

Consider this an extension of the Lapp bend
which itself is the i SB[/i] reversed.