abaqus - connector or constraints

Hi,

 I am relatively new in abaqus environment and i have a question about relatively easy topic. But i would like to ask kindly for your assistance.

I a working on a model - regarding bending of tubes. I would like to connect or constraint 4 elements (rigid or deformable it doesnt matter - placed in one plane, equaly spaced in one plane, around the tube's lonitudial axis),

to a single Ref. point positioned in the center axis of the tube. I want to do that in oredr to achieve behaviour of this 4 elements composition, as one. Therefore. by adding load to

this centered Ref. Point, these 4 elements would follow the movement. While applying load or movement to that Ref. point, tube would bend and these 4 elements should adapt their position to 

the local curvature of tube.

I have tried using connector assignments between 4 elements(proj. cartesin + rotation)and a coupling constraint between one of 4 elements and the center MAIN ref. point mentioned. After trying several different combinations of these settings

it did not work.

Do you have any ideas of how i could do this?

With respect, Kind regards

Matej