Alternatively, you might just get rid of the X mount altogether by making a triangular ply sandwich and mounting the motor directly to the ply using the three small bolts that attach the motor to the X mount. I did this [link=http://www.rcuniverse.com/forum/fb.asp?m=10361753]on the Sickle[/link] and it is plenty strong and weighs a heck of a lot less than the X mount with standoffs/bolts/whatever.