No sooner than that extension took place, in 1940 the majority of it was reversed when a southward extension of SR 729 replaced the segment between SR 73 and US 22/SR 3. Consequently, in lieu of SR 350 being reinstated to its 1938 eastern terminus at SR 73, it was instead routed to continue southeast along SR 73 from the new southern terminus of SR 729 into New Vienna, where the route came to an end at its present eastern terminus where SR 73 meets SR 28.
Shortly after that modification occurred, in 1940 the majority of it was reversed when a southward extension of SR 729 replaced the segment between SR 73 and US 22/SR 3. As a result, instead of SR 350 being restored to its 1938 eastern endpoint at SR 73, it was redirected to continue southeast along SR 73 from the new southern terminus of SR 729 into New Vienna, where the route concluded at its current eastern endpoint where SR 73 intersects SR 28.