Originally Posted by tech69x
Any motor will fit I have already tried
Not necessarily. If mounting on top, yes, but not if mounting on bottom between the upright plates as Matt wants to do. His 250 motors must use the included motor mount. If the width of the tabs are greater than 6mm, it will not fit without interference to the upright plates when it mounts at 45 degrees to the arm. He could get them in there, but is not ideal as it would be pushing the plates to the side. No reason to jerry-rig stuff if it isnt necessary. The 22mm holes for the 250's were placed axially to the arms for this reason. They may indeed fit, but without knowing all the dimensions of the motor mount, there is only one way to be sure.
Please see pic.