I think it is in the housing as well , maybe you ar tightening too tight and do as one said here tighten one side then the other then twist as you tighten till it stops twisting then loosen up a little and see if it will hold with just that much of torque on the housing I gave gad to do that with several of our personal chops , you might want to look in the housing itself , there may be dowels or a single f
dowel that is causing a tilt in the final torque sequence when installingthe housing