In attachment is a assy of a hydraulic cylinder I made.
Afterwards I want to put a design table behind it for the different models and lengths.
For some reason I can't put this assy to "flex".
Always "sub-assemblies with layout sketches must be kept ridgid"
I did not make any layout sketches! Al the parts are made separately , then assembled.
main assy is N0058-003-000
thanx for any suggestions