Page 130 - Eric C. Fry "Knots and Ropework"

71 Seven strands have been used for no particular reason as
this senni! can be made with any number, odd or even,
with a minimum of four (three reverts to being a common
English sennil).
Each outside right strand is used in turn, being reeved
Sennit, under ona/over one until it emerges on the opposite side
where it is laid parallel and becomes the extreme left-hand
strand. Figs 1 and 2 show the first and second strands
Seven so treated. all seven strands having been reeved for the
first time in Fig 3, whilst Fig 4 shows a completed length,
suitably tightened.
Stranded