And has anyone else noticed there probably IS rubber of something in the nosebridge of the X Squared? Mine are loosening despite tightening screws and I have little pieces of rubber leaking out as you do on toasted Juliet nosebridges.
They will still develop some play, but the screws will prevent it from getting as bad as it does on the Juliets. I've found that, like on the Juliets, the rubber seems to break in a little so your never going to get them as tight as they were when new. The flex couplers are also easy to replace by yourself, assuming you can get them of course.