A ‘sling’ is the lip, comprising five constructs, which are: A-Ḥ-H-A B-U-M-Ph etc. And this is the lesser Hei ה (=5).
The five stones of ‘the sling’ – this is higher Hei ה (=5) – and they are the five words of: (Deut. 6:4) Hear Israel Y”Y ELoQeYNU Y”Y.
The five stones are made eḥad (One). The ‘winding’ of all of them is Vav ו (=6), which then comprises the six words of the unity, which are: Hear Israel Y”Y ELoQeYNU Y”Y One.
And with that winding, one needs to encompass ‘the sling’, and to lengthen with it, this stone is comprised of five [Var. ‘of ten’], until it elevates Her infinitely. And the mystery of the matter: (Deut. 17:20)... in order that the days of his kingdom be lengthened...