e91e9179_Oscillating_tools___DIYWiki__Blade_Mounting
[Machine] Current Multimaster [Blade Mounting] 
The current models use a quick release blade fixing system that retains a stud with a lever action mechanism. The tool post also has registration lugs that engage with notches cut around the periphery of the main 10mm mounting hole. Hence the new machines can use Fein blades, and universal blades.
Oscillating tools - DIYWiki
Blade Mounting