Temporarily stop part from moving

[m-d-e]

How do I do it?
An example:
A cylinder is placed using a pin connection. On this cylinder's surface there's another part (B) moving in another direction. When moving part B with Ctrl+Alt+LMB the cylinder rotates as well. How do I easily stop the cylinder from rotating? Do I really have to convert the pin connection to constraints and then back? When doing so I have to re-do the references for the translation.

 

[Saladin]

If you go to the drag window there is an option to lock a
connection.

 

[m-d-e]

Excellent! Thanks