Usage: 3 forms in 14 verses
Form Translated As     In Verse(s)
σφυρωτήροσ knob LXX.Gen.14.23
σφαιρωτήρεσ knobs LXX.Exod.25.31LXX.Exod.25.34LXX.Exod.25.36LXX.Exod.37.17LXX.Exod.37.20LXX.Exod.37.22
σφαιρωτήρ a knob LXX.Exod.25.33LXX.Exod.25.35LXX.Exod.37.19LXX.Exod.37.19LXX.Exod.37.21
knob LXX.Exod.25.35LXX.Exod.37.21

Liddell-Scott-Jones

σφαιρωτήρ (sphairōtēr) a knob G:N-M

σφαιρωτήρ-ωτήρ, ῆρος, ,

thong, latchet, [Refs 2nd c.BC+]; compare σφυρωτήρ.

__II a ball to ornament pillars, knop, [LXX]: plural, as heraldic device, [Refs]

LSJ Scripture Refs: LXX.Exod.25.30*