A significant number of CMM5 Power and Sync Injector modules and Controller modules have shipped supplied with the incorrect screws for the mounting brackets. Use of the wrong screws can result in the brackets not being firmly attached to the unit chassis. Cambium Networks will provide replacement undercut screws for anyone who needs them. Please contact support with the quantity required and shipping information in order to obtain replacements. We apologize for any inconvenience this may have caused.
Additional details, including a photo illustrating the differences between the two screw types, can be found in this post in the Knowledge Base section of the community:
http://community.cambiumnetworks.com/t5/PMP-Known-Issues/CMM5-Mounting-Bracket-Screws/m-p/83021#M31