“Here it is,” Scott Flansburg said, gesturing to a parking lot. “You can kind of imagine it.” It was the site of the old Herkimer YMCA, built in the 1890s but gone since it burned down decades ago. Flansburg and others in town are convinced that this is where basketball was invented — not, as the famous story goes, by James Naismith and his peach baskets 160 miles east in Springfield, Mass., but by a 16-year-old Swedish immigrant named Lambert Will, who tossed cabbages into crates.