Here is my HAMP:
And yes, that is a 14 dart double sided rainbow clip:
It has a perfect seal because I used an o-ring instead of yarn.
Edit:
I decided to take pictures of all the nerf homemade materials that I have. I'll start off with polycarb:
The blue stuff is an 18in. by 11in. piece of 1/4in. Polycarb that I bought for 11 dollars at my Ace. In front of it is 1/16 polycarb I bought from home depot. I don't know the demensions of it. I bought it for 12 dollars, because I didn't know how cheap it was at Ace... In front of all of it is a scrap piece of plastic that came with something. It is super weak, but it works great for gap sealing.
Thar is a 3/16 piece of black polycarb that my dad gave me (he used it to build a windsheild). Behind it on the floor is a small replica of Kind Tut's toom that I made for a book report. I made it out of hot glue. popsickle stick, and cardboard.
That is 3/16 polycarb that I got for Chrismas.
Now it's PVC time!
Thats just a little bit that I took a picture of. I keap the rest in my basement.
And just to clarify, I paid for all of this myself unless stated otherwise.
Here is a little teaser...