HTIQ masking system: Manual 4 way for an 82inch diagonal 16x9 screen. I used it with a Stewart screen. But I am moving and I have to sell them. (http://www.htiq.com) Cost was c. $475. It is less than one year old. It's yours for $299. I prefer a local buyer (SF Bay Area), but will ship (buyer to pay actual packing and shipping charges). See my feedback at ebay (nathan_h).