Mine did the same thing in Jan, the only magnesium part is the snapped part and it's supposed to do just that. Knock out the roll pins on one side, pull the pin on the other side, put the 2 hunks back together and trace it out on oak use a band saw to cut them out. Make sure you remember how they came out of the frame, with the oak in the frame drill holes through the wood a tad smaller than the roll pins, then drive them back in and you will be good to go. When you put it back up use 2' stakes on the arch pads and use cable and ground anchors on each arch,
View attachment 481800 don't need a jack hammer to place them. You and I didn't read that part of the manual
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http://www.steelsoldiers.com/showthread.php?119071-Tent-gone-wild!&highlight=