For flappers, at the Carpet Nats this year, we used 1/2 in thick vinyl moldings from Home Depot. They were about 8 inches wide, so we ripped them lengthwise in half (producing two 4 inch wide, 1/2 inch thick pieces). We then doubled them up to make a 1 inch thick piece. A single piece had too much give when used as a flapper. A few 1 1/4 inch deck screws screwed in from the face of the flapper (through both pieces) worked great to hold the pieces together.
*** The Gate - Celebrating 7 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car