I have build an assembly of a bicycle that is composed of 4 main parts. I would like the rear suspension to swivel about the crankshaft. The shock absorber should be compressing it as well. The problem I am having is that when I mate the rear triangle to the swivel that is attached to the frame and shock absorber the rear triangle is locked. I have tried to use cocentric mates, and hinge mates but they still lock up for some reason. I also checked that the "lock" is not checked. For some reason it work fine when only 1 mate is used, but the whole asssembly needs far more than that. Any suggestions? I have also attached a couple of screenshots.