My rocket wobble around docking port part

[FreedomFighterEx]

So i try to fit both Service Module and Lander together in single Rocket, i put the separator and then follow by docking port of Lander Module, i strut the LM against above structure part but when launch, it still wobble and break off.

I even try to do follow the tutorial on wiki, that same part also wobble too even with strut connector, how do i fix this problem?

[DisarmingBaton5]

Can you still see the lander? If so, you need more struts.

[FlamedSteak]

How many struts? You need a minimum of 4. If it still wobbles make it 6. If it still wobbles radially attach 4 girders and strut them up and down for extreme rigidity.

[ferram4]

How much thrust do you have? If you're not trying to land it, you don't need a TWR greater than 1, and lower thrusts reduce the stress on weak connections.

[FreedomFighterEx]

Seem like i need to go for extreme strut then

[DeMatt]

A lot depends on just how monstrously big your various modules are. If you can, try strutting BEYOND the two parts on either end of the docking collars.

A picture would help.

[FreedomFighterEx]

Ok, seem i use too less strut, now i strut every single part together and it solid now.