  We explore the effect of lattice anisotropy on the charge-ordered
superconductor 2H-NbSe$_{2}$. Using a novel strain apparatus, we measure the
superconducting transition temperature $T_{sc}$ as a function of uniaxial
strain. It is found that $T_{sc}$ is independent of tensile(compressive) strain
below a threshold of 0.2\% (0.1\%), but decreases strongly with larger strains
with an average rate of $1.3\,$K/\% ($2.5\,$K/\%). Transport signatures of
charge order are largely unaffected as a function of strain. Theoretical
considerations show that the change in the behavior of $T_{sc}$ with strain
coincides with a phase transition from 3Q to 1Q charge order in the material.
The spectral weight on one of the Fermi surface bands is found to change
strongly as a consequence of this phase transition, providing a pathway to tune
superconducting order.
