like I said before it beats working for a living. I get to work at home. pick my hours and people keep giving me money, how great is that this another thing I do for chops. it's not hard but so many people p*** on this part. this one is a little different my GMC vent frames were rusted thru and being a cheap old ******* that I am I took some stainless steel 47 Mercury inner vent frames and the cut down GMC outer frames and reformed them both. main thing to get them to operate properly you need the top and bottom pivots to line up. you might notice that I drilled the rivets out of the Mercury bottom pivot and moved to line up with the top pivot. normally I can just move or even bend the top pivot. much easier