You need to take and adjust your tie cords, your material on your double bull has stretched and that's normal, you need to adjust your tie cords so that your polls don't come out, you need to set it up, adjust the tie cords so they are tight, but not over tight, and then the polls won't come out.
I have had more customers bring back a double bull, and tell me the polls just came out by themselves, and nine times out of 10, the cords were either lose, or untied.
And double bull blinds, are well worth the money, and work well if you use them properly, I have had the T 5,T 2, and now I have the Dark Horse, and for those that say it doesn't work, you have to brushed it in to much, look at your surroundings, sometimes brushing it in too much, will make it a dead giveaway, you have to look at the forest around you, if the trees are lightly leaved then you have to do the same thing with your blind, your tool is only as good as how effectively you use it, you do the same with your bow and arrows, you have to do the same thing with your blind. Hunting is work, going out and killing is not. That's why they call it hunting. You find what works, and do it over and over and over, it may be boring doing the same thing over and over, but the wild game don't know you're doing it if it's done properly. Find out what works, and use it, you'll enjoy it more.
I do agree that double bull blinds are expensive, but not using them properly, is even more expensive. And getting a cheap blind, and not using it properly is even more expensive.
Brooks, says over and over again, don't mess with the tie cords, the tie cords hold the bottom and the top of the blind together, they are two separate parts, if the tie cords are loose, your polls are going to come out. It's not rocket science, its physics.
Carl