Solidworks piston assembly won't move

[Metiz]

Hi,

I've build a small piston assembly in solidworks but I can't get it to move. Everything's fixed, but if I remove some mates, individual parts start moving in ways they shouldn't. The piston needs to rotate while staying upright and the 2 cranks (the 2 big base parts) need to rotate around their axes.

So like this

The files are located here. Couldn't upload rar or sldprt http://www.filedropper.com/technischtekenen

Can anyone please help me with this?

 

[Metiz]

I "solved" the problem. I made a block with a hole and mated it to one of the axles. I fixed the block in place and now I can move the assembly like it should. I just hide the block to not mess up my model.