Putting it out thereas I already put my RV in storage without checking to see what size screw this is when returning from my last trip. There's suppose to be 2 at each black end cap, but as you can see, 1 fell out. The others are rounded with a square head..aka: Robertson (looked it up)
I had the same problem with my awning cap screws coming loose. My solution was to pound plastic wall anchors into the holes, then use appropriate screws in the anchors. The anchors expand inside the cap so the screws don't come loose.
I had mine come apart in the snow and ice at a farm in North Carolina in December. Looked like a big issue, was not.
My awning is used frequently at track and even at home. One screw had apparently fell out. The other pulled loose due ice/slush preventing arm closure. Since I was at farm ladder was readily available.
I ended up using short #6 or #8 self tapping sheet metal screws. Thread was only 1/4" to 3/8" plus drill point. I did use stainless. Took me longer to find drill than effect repair. I also checked other end and it was loose so I replaced those screws as well. I cannot post pic but they have 5/16" hex head. Take one of original screws for size reference. I did not use anchors as it was through sheetmetal into pot metal or aluminum casting.
I checked them yesterday while washing unit. They are still tight.
The rear awning screws for my 34J Hurricane don't exists on the front side of the endcap cover. It snaps on. And it has come off trice. Thor was really great and replaced it twice. Now I have "100 MPH" tape to hold it in place. Looks bad but at least I will not drop off another piece as I travel.
I got great support from Thor when I called, but the awning manufacturer should really design a better solution that screws together or at least clips on with some locking mechanism that will keep the cover on.