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Welcome to just answer
The Mercedes slide hammer hooks under where the clamp would be so as not to damage the injector , i don't know what sort you have but if we had one that was really stuck in we have to break of the top of the injector and use a hydraulic puller,this would screw on to it, so as to force it out. note if you was to remove the top you will have to replace the injector as small springs and metal parts go flying out.
Feel free to ask more question even after i have answered as i would like to see that you get the job do ok.