If you have extras, put the rings from your jars into the bottom of the pan.  In a pinch you could use folded up newspaper or a towel.  neither of which is that good, but better than nothing.

Try also a cake cooling rack, if it will fit your pan. 

The rack is just there to keep the jars off the bottom of the pot, and to make it easier to load and unload. You can use a cooling rack, if you have one that fits , or the wire rack out of a toaster oven, or cut the tops & bottoms off of a bunch of tuna cans and put them in the bottom of the pot, or whatever else allows water to flow around the jars. Use tongs to get the jars in anad out, and you're good to go.

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