A verb in The Etymologies of the 1930s appearing in its Noldorin-style infinitive form nestegi “insert, stick in”, derived from ON. nestak- under the root ᴹ√STAK “split, insert” (Ety/STAK). As such, its unmutated stem would be ✱nestag-. Its initial prefix ne- is derived from ᴹ✶ndē̆- “in, inside” under the (deleted) root ᴹ√NĒ̆ (EtyAC/NĒ̆).
A verb in The Etymologies of the 1930s appearing in its Noldorin-style infinitive form nestegi “insert, stick in”, derived from ON. nestak- under the root ᴹ√STAK “split, insert” (Ety/STAK). As such, its unmutated stem would be ✱nestag-. Its initial prefix ne- is derived from ᴹ✶ndē̆- “in, inside” under the (deleted) root ᴹ√NĒ̆ (EtyAC/NĒ̆).