  We study one-parameter families of $U(1)^2$ preserving deformations relating
pairs of toric quiver gauge theories on D-branes probing local toric (pseudo)
del Pezzo surfaces. The superpotential deformations are defined by zig-zag
paths in the brane tiling and are non-trivial in the chiral ring if the
geometry has a non-isolated singularity. In the dual $(p,q)$ web, the
deformation is realized as a Hanany-Witten move that reverses a semi-infinite
fivebrane. We use these deformations to find RG flows between 4d
$\mathcal{N}=1$ SCFTs on D3-branes probing local toric (pseudo) del Pezzo
surfaces of the same degree, and briefly comment on the interpretation for BPS
quivers of rank one 5d SCFTs on $S^1$.
