I have one in my HFGH. My house is set up for starting bedding plants so I have shelves along each side so it doesn't get in the way for me. You can see my original installation in the pictures I posted a few weeks ago in the thread about my construction and north wall insulation here http://forums2.gardenweb.com/forums/load/strucs/msg121339449284.html?8 I had problems getting it adjusted so that it would open and close at a higher temp so I have since added an aluminum angle, attached a redwood 2x4 block to the aluminum angle and attached the univent to it. It works much better that way. I'll try to take a picture and post it this weekend.

Did you use the Search function at the top of the page right above the Forum name? I did, and I found many pages of info, discussion, and tips, like this one: Here is a link that might be useful: HFGH

First, I'd raise a huge ruckus with Harbor Freight, on the phone, and be very aggressive as needed. I would not wait very long to get a call back from them; I'd keep calling. Harbor Freight customer service, unless they have improved in recent years, is not known for outstanding response time. Try to insist on immediate shipment of the missing part, and ask them to email you the tracking number, so you know it has been shipped. If they hem and haw about this, and can't give you a promise of fast shipping, and tracking, it may be a bad sign that this part is not one that they normally stock in their US warehouses. If the part is not in stock for immediate shipping (like, panel clips and panels, which they keep on hand) it could mean a very long delay. It used to mean (years ago) that they would tell you they'd ship it in a few weeks...and six months later, people were still waiting for a missing part. Maybe they have improved their track record on this point. Since the kit is assembled in China, I always assumed these long delays meant the part had to be shipped from China, but I'm not sure they'll be honest with you about it. If they can't ship pretty quickly and give you a tracking number, I'd start to be a little worried. Did you buy the kit in a store, or order online? I recall one post from a person who bought their kit in a Harbor Freight store. When they found it was missing a piece, the store manager (astonishingly) opened up another kit to replace the missing piece. I frankly think this was an exceptional store manager, so I'm just mentioning it as a long shot. If you don't get good response from Harbor Freight, please post back, and I'll try to help you brainstorm how you could temporary a piece (out of wood, or something else) so you could complete your greenhouse, and add the piece later. I just checked my own greenhouse, and I think it might be possible to do this, since part 23 is only about 1' 5" long, and its main function is to provide a track on both sides to accept two of the gable poly panels, that go above the door. Of course, it would be much better if they can send you the correct piece, so my first response is to be as proactive as you can (go ahead, yell a little, be assertive.) Don't assume they will take good care of you just because they should. Could be worse...could be late October, with snow moving in...or, it could be a completely critical piece that would stop your build completely. Please do let us know what they say. Sheri

katrina_gardener - a few of us went through nightmares assembling the 10x12, but as time passed and I tracked the posts here, it appeared that they really improved the instructions, etc. You will likely be very happy with the greenhouse. I made a few of the upgrades that gardenerwantabe described in his posts, including the cross-bracing at the top of the walls with rigid conduit, and aluminum angle-iron across the door. You asked about placing your unit on the ground. I did not choose to do that, as many did not. Personally, I built mine on 2x12 pressure treated lumber. If I were to do it again, since I am growing veggies, I'd use cedar. I learned of its availability several months later. Then I used lag screws to secure the greenhouse to the 2x12 footing. (I used some regular non-treated wood as a divider between the PT and the metal base because the chemicals in pressure treated lumber react badly to metals.) Others have used 4x6 timbers, for example. I used the 2x12 because I am in snow country and wanted a bit of height. The 4x6 results in a shorter step in and out of the greenhouse. When you receive it, read all of the directions start to end. That way you will have a sense of the assembly process. I discovered that knowing some steps that were coming ahead allowed me to better understand the prior steps and short-cut some of the assembly. Just make sure you get everything very square so that when you start installing the operable panels in the roof they will fit properly and open/close with ease. Post your questions and you will find there are many here with experience building the unit. You should be just as happy as many of us are. Here is a link that might be useful: My HFGH 10x12