[Kevan]

I had a look at my Revoslot Marcos today, and it was impossible to get the motor secured without adding some washers to the motor mount screws. Also one of the motor mount screws sheared off when I tried tightening it, so had an interesting time trying to recover the thread out of the motor mount 
I have replaced the screw although it seems to me still misaligned now in the mount. But if feels secure, and the car appears to be running a whole lot better.

Another option is shorten the screw