Bettinardi Kuchar Armlock 1
While the USGA and R&A banned players from anchoring putters in 2016, Matt Kuchar’s style of locking an extended-length putter to his forearm remained legal. Kuchar worked with Bettinardi to develop putters suited to this style, with extra loft (about 7 to 9 degrees) to counteract the forward press the technique creates. The Armlock 1 was released in May 2013.