Contact Surgery Numbers of the 3-torus

We study contact surgery numbers for contact structures on the 3-torus. We show that all contact structures obtained via contact surgery along a Legendrian Borromean ring are overtwisted, and that this construction yields infinitely many pairwise non-contactomorphic contact structures on ${\mathbb{T}}^3$. We prove an obstruction on the maximal Thurston-Bennequin invariant of 3-component links to produce ${\mathbb{T}}^3$ by Dehn surgery. On a side note, using Legendrian surgery and the ruling invariant, we show that the total symplectic homology of Stein fillings of $({\mathbb{T}}^3,{\xi }_1)$ is non-zero.