In Ball v. Bigham, 990 S.W.2d 343 (Tex.App.--Amarillo 1999, no pet.), the out-of-state defendant, Bigham, personally made a contract with a Texas resident which included Bigham's personal delivery of an irrigation engine to Texas, as well as assistance in installing the engine. Id. at 345. Bigham personally returned to Texas to perform repairs on the engine. Id. The Court held that Bigham's agreement to deliver the engine to Texas and assist in its installation were activities purposefully directed at Texas. Ball, 990 S.W.2d at 348.