General vertices in ordinary quivers for symmetric group algebras

In [J. Pure Appl. Algebra 142 (1999) 249–260], Martin and Russell construct part of the ordinary quiver of the principal block of in characteristic p; they define the notion of a general vertex and show that, around general vertices, the quiver assumes an n-dimensional lattice-like structure. Here we use different methods to find more vertices in the quiver of this general type.