How-to permanently deactivate center-fire amunition primers?

So I have a friend who wants to use some new (bullet pulled powder
dumped).45 acp CCI Blazer (aluminium) cartridge cases to cover some bolts on
his motorcycle engine.(I don't know why) These primers are non-corrosive,
non-mercuric in a non reloadable case.
 I want to permanently deactivate the primers without snapping them since
this would distort their smooth appearance. In this service they will be
exposed to engine temperatures so I want to make sure they deactivated.
What is possible?