How can I make weaker props strong enough to survive very bad wind?

Ditto what Witchy Kitty said goes for me too. Most of us learned the hard way as I still have visions of my window witch coming loose in a strong gust and flying down the street. I have to deal with wind all month long and tend to pick a warm calm day at the beginning of the month and spend more time bracing everything than I do most anything else. Rebar or threaded stakes for the tombstones. I tend to use the 6 foot threaded bars from Home Depot for my skellys and lifesize props, 3-4 foot if they're posed on the ground. They're a little cleaner, thinner and easier for me to work with when doing it myself . I go with the medium width for enough strength. I know most go with the rebar as it's cheaper. I'm not one for taking mine all apart like some of the more skilled people on here so for me the bar goes through the hip and ziptied to the front of the spine and resting securely under the chin. The cardboard shoulder type props get duct taped to protect them. (I learned that after having a prop's shoulders shred to mush in my rainy, windy October weather). Those type of props get a pvc pole slid over the metal rod into the neck or with a T connecter and 2 pipes on the sides to shoulder size if there's no hole through the head. I'm a little anal and if you can see it I will paint the bottom part black and the top bone colored for the skellys. Fishing line is my best friend. I then brace the rod with the fishing line to the cemetery fence or tent stakes and it has worked very well for me. Like Witchy if they have fabric I thread the fishing line through the fabric in spots to the tent stakes in the ground to make sure they don't turn. I make a mental note to avoid tripping myself anytime I walk into my cemetery though it has happened Helps with anyone that may think of helping themselves also as I tie everything down so if they are successful in getting it loose they'll probably trip on their way out. Other than the year of "Sandy" I've had pretty good luck with everything staying put throughout the month with no more than minor swaying of some on very windy days.