I'm probably wasting both mine any yours time, but I have a 6x8 Harbor Freight and this is how the pop up vent(s) look on this particular model.

First on the top - A 'piece' slides in this channel (PHOTO):
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The bottom of the vent:
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Still the Bottom
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The finished product:
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The vent (finished project)
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Best I can do glen. That 10x12 probably is different - just trying to help.

(Anybody else wanting a complete setup (photos and text) of the 6x8, let me know. I have it as a copy/paste MICROSOFT WORD file - and can have it up in a jiffy)

Good luck Glen, these things are a masterpiece of doom and disparity, and the throwing of tools! (It's truly like the directions were written backwards at times. At least with this 6x8 - who the heck knows)

See ya.

Dax

10x12 and 6x8 vents are the same.

I'll re-post that Microsoft Word File -

Dax

Thanks for your help, especially the pictures. As we all know, the instructions provided by HF are a bit vague.

I still dont understand. It took us forever to get ours up. I really have to give gardenerwantabe lots of credit. It was you who put the first one up was it not? I bought mine right after you got yours and it has taken my son this long to get it up and finished. Course it sat in the package for a long time before he had time to start and then it took a long time to get done as he only could work on it once in a while.
We dont have the vents all done either. They r in but that is about it. It could have been done in half the time if the directions had been written right in the first place. We had to redo so many things but did not end up drilling many holes. Just a few.

My son is trying to figure out how to put on the attatchments and also how to make it so I can open them standing on the ground. Any ideas? I guess we r not to smart cause it has us stumped.

Since the handle already has holes in it you could go to Lowes or Home Depot and get a 10ft. piece of 1/2" conduit it will only cost about two dollars. Cut it into four pieces put in a vice and smash the end, if you don't have a vice use a hammer to flatten the end. Lay the Handel that came with the GH on the flat part of the conduit and drill holes then bolt them together. Drill some small holes in the conduit to put on the pin to hold the vent up.
I put the automatic openers on mine but you can run them by hand just not as convenient.
THANK you for the glowing words glad that i was able to help.
We had 80mph winds again last week and no damage to the GH glad I did the modifications to strengthen it.

Thanks for the idea gardenerwantabe. I will tell my son and he can make me one. He also mentioned this morning that he saw in HF catalog that they carry automatic openers. I have not checked into that yet. Been to busy to find time to do that. Kind of leery of buying something from HF after the greenhouse situation. If my son was the kind to swear we would have had a blue fog when he worked on my greenhouse. :>)

I priced several of them and was going to to buy the Bayliss but they cost $69.95 and HF had them for $ 19.95 so I bought four of those. Time will tell if it was the right thing to do. Everything you buy anymore is made in china regardless of the price.
Just because something cost more is no guaranty that it is better. I went to my local chevy dealer to buy new wheel bearings for my Corvette and they are made by a company called Chicago rawhide and sell for $ 440.00 each I wanted four of them. I went to Autozone and bought Timken bearings these are the best and they where $ 150.00 each.
Usually you get what you pay for but that is not always true sometimes you can pay more for less like the bearings.
Anyway in a few years I will know if the HF openers are worth buying.

Buying 4 for a quarter the price increases the chance of survival in the case of failure too - if you have a 1% a day failure for bayliss (this is for example, I'm sure they are more reliable than that!) and a 4% a day failure for el cheapo brand, and having any one vent work is good enough to protect your plants you'll have a 1 in 100 day chance of plant death on any day with bayliss and a 0.04^4 = 1 in 1000 year chance of disaster with el cheepo. Even if you need 3 el cheepos to be working you'll be 1.5 times safer than with 1 bayliss.

I'm not much worried about plant loss since I'm retired and home nearly all the time and before I leave I can check to be sure the vents are working. I also have a wireless thermometer so I can monitor the temp while in the house.
If the roof vent fails or if they open but the temperature rises another 5 degrees above the open temp of the roof vents a thermostat will open electronically controlled shutters on the sides and turn on the exhaust fan and power ventilate it so loss of plants is not likely.
I don't need the roof vents but my hope is that most of the time I can cool without using power assist cooling and save energy and $$$$$$