In these systems , all the tension screws can then be tightened or loosened by one handle .
To tune the timpani , the '' tension rods '' can all be tightened or loosened .
To tune the timpani , the '' tension rods '' can all be tightened or loosened .
Simplifica esta oración: In these systems , all the tension screws can then be tightened or loosened by one handle . Producción: