The former Scottish strokeplay champion from Cardross who will resume his campaign on the European Challenge Tour next week, made the most of an opportunity to compete on home soil and pipped Callum Macaulay, Jason McCreadie and Chris Doak to the £1700 first prize.
Henry birdied three of his last six holes in a three-under-par 69 to finish in a tie at the top on eight-under 136 before knocking his approach to two-feet in the sudden-death shoot-out and holing the decisive birdie putt.
Macaulay's 67 – he had four birdies and a bogey in the first five holes, and an eagle at the 13th – was the best of the four over the regulation 18 holes and he seemed set for victory but could only par the last five holes, a stretch he had covered in four under the previous day.
Lloyd Saltman and Andrew McArthur shared fifth on 138 while the Pollok amateur Conor O'Neil was seventh on 139 after a 68. Alastair Forsyth shared ninth with Craig Matheson, Gavin Dear and David Law on 141.