This thread will help to explain how a spyder or spyder clone works.
There are 5 basic parts that work together to fire a paintball with each shot. Here is a list of them and there location in the marker:
1).
Sear - top of the trigger frame
2).
Hammer or striker - Bottom tube, towards the back of the marker
3).
Main Spring Assembly - behind the hammer, includes spring and spring guide.
4.
Valve assembly - bottom tube towards the front of the marker.
5.
Bolt - occupies the whole top tube of the marker
Here's how all the parts work together
Connected to and above the trigger is what is called a sear. This catches the hammer/striker which is connected to the bolt and holds it in place directly above the trigger. When you pull the trigger, the sear drops and with the aid of the spring, the hammer/striker slides forward, hits the valve pin, and opens the valve. The valve dwells (how long it stays open) long enough for air to enter the valve body and then go up into the bolt through a small hole. The bolt is in the forward position as we speak. The air comes out the face of the bolt and pushes the ball out of the chamber, through the barrel, and out into the wild. Jump back to the valve. As the air goes up into the bolt, a certain amount of air sneaks out of the back of the valve through a small space that is there because of the flat part of the pin. This puts the Bolt/Hammer (striker) assembly back into its cocked position above the sear and ready to be fired again.
Otter's Diagram
Otter SC's explanation
Still open for suggestions.