Here you go Bean:

I get 10 ft length of 1 inch diameter pvc and the caps come in a bag of 12 at Lowes. Really cheap. I cut the pvc in 2 inch lengths and then put the cap on. you can glue them or just pop them on and tap them tight with a hammer. I then drill quarter inch holes through the cap and pipe for scent dispersal.
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I also prefer to weld a fender washer on teh stake. This helps alot to satablize the trap.
I then can prebait all my dp's. Push the spring like you are setting it and then put he cap in the hole and let the spring compress on the cap.
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Then when i go set them I can just compress the spring latch the dog and slam them in and go to the next.
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