Single Center Spring Buggy Company was an American carriage and automobile manufacturer based in Evansville, Indiana.

Starting around the turn of the century they began manufacturing automobiles against the wishes of Jones and St. John who subsequently left the company.

[3][1] In 1911 Single Center ended automobile production and subsequently Willis Copeland became Evansville’s first Chevrolet dealer.

His car was put into production by the Single Center Spring Buggy Company, as the Zentmobile in 1903.

His new Zent was powered by a three-cylinder 18 hp engine mounted under the hood, and featured shaft drive.

He traveled to Evansville, Indiana to talk to Willis Copeland of the Single Center Buggy Company, who agreed to build the car for him.

[6] In 1906 now a New York City consulting engineer, Worth was brought to Evansville by Willis Copeland to get some fresh production expertise and help design the Windsor.

[1] After the Windsor venture quickly failed, Worth designed a high-wheeler which he talked Copeland into building.

It had an air-cooled two-cylinder engine, double chain drive, tiller steering, and the friction transmission used in the Windsor.

This friction drive was originally devised by Worth for the Chicago built in the late 1890's in Harvey, Illinois.

Reportedly, his vice-president disappeared with the last car in the factory and as many leftover parts as could be fit into the back seat.

Its most distinctive feature was its friction gear transmission which did away with the clanking chains Copeland had disliked in the previous cars.