Sheik Omar shows us one of his latest creations. It's a sleek rocket that stands about three feet off the ground. The thing looks sophisticated. It's hard to tell he's cobbled it together from bits and pieces of unexploded ordinances fired by al-Assad's forces.
Sheik Omar gingerly holds the rocket.
"From here to here, for example," he says, tracing his fingers along its body, "It's our adjustment, as are the fins."
It's a crude device, like many of the ones he makes. Sometimes he would construct something and it would, mid-flight, turn around and shoot back at him.
But these are the hazards he's willing to deal with.
Sheik Omar uses the word democracy. Syria could be democratic, he believes.
First the al-Assad regime must go. But that won't be the end.
There will be a revolution after this one. The rebels will have to fight a confusing lot of others who've jumped into the violence these many months.
Revolution begets revolution, he insists. It will take several cycles of violence before Syria can hope for peace.
What other choice do people like him have? he asks. How else to get rid of the extremists?