create a part with a variable length

Hi,

I have a almost finished assembly and the last part to integrate is a part with variable endpoints. Does someone know, how to create a line or a thin cylinder and to fasten the two endpoints on two other parts of the assembly (see the attachment: the plattform in the middle need variable connections to the Aluminium-Profiles). That means if I move one of the endpoints, the attached end-point of the line will exactly follow the traveled distance. Enforced, the line (thin cylinder) will automatically change its own length.

I would really appreciate it, for every little helpful answer! Thanks.

Best regards

Reiner

SolidworksParts And Features