[RC-Monster Mike]

I think the "too much weight hanging off the screws" is more paranoia than legit concern to be honest. The screws are held in tension and friction is really what holds the motor in place(from the screws pulling it against the mount). The actual amount of force required to pull an m3 screw out of even aluminum is measured in thousands of pounds and the screws themselves are not the weak link(it is the threads in the aluminum that will fail first). If you have sheared a screw in a similar application, it was likely a low grade screw that was loose to begin with. :)