You can best place the exuvie on a wet tissue in a closed plastic box and wait for one day (tissue moist for zygoptera, pretty wet for large anisoptera). The exuvie should be flexible again after a day and you can pin it in every position, like other insects. I followed this method preparing all exuviae in this book: https://www.bol.com/nl/nl/f/fotogi…ellen/34172423/. In the beginning, you may loose some parts, but after a bit of training thing get less difficult.
Many thanks for the quick and informative answer! 
Sometimes you need to "click" the joints loose. If you just pull on a leg or mentum, it might not bend on a joint, but halfway a body part, resulting in damage. Therefore you can grab the limb just before the joint with tweezers, then push against the free part of the limb until it clicks. Then you are free to go and the body part wil bend on the joint every time
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