<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_1_1456451559771_2479">Brian,</div><div id="yui_3_16_0_1_1456451559771_2479" dir="ltr">I had the same problem you had. I welded the hinge to the hatch after machining, thinking it would not warp because it is super thick and heavy. Well yesterday I got my new o-ring and decided to do a final clearance check and sure enough it had a tiny warp. So today I spent the whole day setting up the hatch in the lathe and re-faced it. It is a blessing in disguise because I found that I made the o-ring groove to small, not sure how that happened but it is all good now. The vacuum test is going well.</div><div id="yui_3_16_0_1_1456451559771_2479" dir="ltr">Hank</div></div></body></html>