Bromberek, D.J. Jansma, W.G. Smith, T.L. Waldschmidt, G.J. Mechanical Straightening of the 3-m Accelerating Structures at the Advanced Photon Source JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-WEPOB70 English 1051-1053 WEPOB70 ion linac photon operation alignment Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-WEPOB70 https://jacow.org/napac2016/papers/wepob70.pdf A project is underway at the Advanced Photon Source to mechanically straighten the thirteen 3 meter accelerating structures in the Linac in order to minimize transverse wakefield, and improve charge transport efficiency and beam quality. Flexure supports allow positioning of the structures in the X & Y directions. Mechanical design of the flexure support system, straightening techniques, mechanical measurement methods, and mechanical & RF results will be discussed.