I've never used flexible mates much and was wondering if there is some tutorial help somewhere on the subject. There doesn't seem to be anything in the online tutorial and the help file is very brief. When I put a subassembly into a higher assembly, things don't work. An example is a common machine slide assembly (Slide.Sldasm). Carriage.Sldasm has the usual mates to keep it running on the ways of Base.Sldasm and maybe a limit mate for the x travel. I put Slide.Sldasm into a higher level assembly, e.g. Machine.Sldasm, and then in FM->Component Properties for Slide.Sldasm, I check Solve as Flexible. I then constrain Tool.Sldprt to a face within Carriage.Sldasm. I can use the mouse and the grab tool (Move Component) and the combination of Carriage.Sldasm and Tool.Sldprt will move within the X travel limits. While this looks cool, it serves no purpose. If I try to put a mate on Tool.Sldprt to locate it relative to anything within Machine.Sldasm (and pull Carriage.Sldprt along with it), I get overdefined errors all over the place and nothing moves. In a new swx release, I often don't have time to research whether a new feature actually works, so I'll continue to use an old method, and I think I have for 2 or 3 releases in this case. I certainly hope I have missed something.