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Three.. bolt carrier return spring, trigger return spring, magazine release return spring.
Not sure what you are talking about. If you are referring to a part in the engine then the piston does not have a return spring. If you are referring to the piston, not quit the right term, in the brake area then in the wheels the there is a spring and in the actuator there is a spring. No other item I have ever heard of as a piston return spring. Can you elaborate?
Persephone's return to the Earth and Demeter marked the beginning of the first spring.
You don't "tighten" the belt, it's self adjusting. If the belt is slipping you probably have a problem with the tensioner spring. Occasionally the spring weakens over time. Pull the tensioner and replace it if you think it's loose.
In the spring of 2013
Spring 2010
In spring after they return to their nesting grounds.
Yes, in the spring of 2010.
the belt is automatically tensioned by a spring loaded tensioner.
The belt has an automatic spring tensioner and can not be "tightened".
first the spring puts tension on the belt, then you tighten the tensioner assembly and it hold there.
Those really don't get repaired - they get replaced. Just takes a couple wrenches to get the old one off and tighten the new one in.