<span class="Apple-tab-span" style="white-space
re"> </span>So I looked at the turret sag problem again. My shims lift the turret but do not address the sag problem. <div></div><div><span class="Apple-tab-span" style="white-space
re"> </span>The sag seems to be the result of the weight of the DMD unit, and to a lesser degree the battery, being cantilevered out on the lower turret half. Lack of stiffening webs allows the ABS deck to sag over time. I find it strange that with a perfect weight bearing truss RIGHT there, Tamiya did not choose to use it.</div><div></div><div>I looked at the turret upper half as a 3D rigid polygon, and saw the truss system we needed to offset the pull of gravity. By adding a small tab to the back part of the turret lower and cutting a corresponding slot in the turret upper I was able to transfer the downward loading ( red arrow ) in the turret lower into the turret upper ( white arrows ). This then acts like a truss ( yellow lines ), think crane boom or bridge section, and transfers the loading horizontally ( white arrows ) over to the two locking knobs that join the two halves. This made the turret strong enough to hold up my controller without touching the deck. It also has the added befit of indexing the two turret haves in the back area where they need to be.</div><div></div><div></div><div></div><div></div>