Headunit cage help!

[Clio182CG]

Hi guys im just fitting my new headunit but the cage doesnt stay in the slot, its very loose and will come out with the stereo, is there any way to make it fit tight? Its a Pioneer stero and my car is a 2004 Clio 182. Thanks

 

[S1MON]

Are you bending all the pins/fingers out?

 

[Thrill]

Stick standard