NECRO! Well.... Follow up.
I was looking at this wondering if what I'd read was worth giving a diddley-squat about...
So, I went to Home Despot today, and got myself one of these (sorry, took the pics after I made the cuts.)...
As you can see, I cut off the threaded ends. Then I placed it on the plastic orange tip like this...
Well what do you know! It's nice and snug! So I went to pop it off when this happened...
The awesome part is the fact that it fits so tightly I have to twist pretty firmly to remove the PVC/orange tip combination. I'm going to go ahead and glue the two pieces together so they are permanent. I will post pics of the finished result. Here is the exact part I used, it's a garden sprinkler extension piece...
Don't go being an idiot with these instructions.