I've done many of these and I was surprised at how easy they were to remove, the remaining part of the bolt is very easy to drill through also. I pilot drilled using a 1/8th drill bit then redrilled using 1/4 bit then used an easy out to remove the broken bolt.
I found what also helps is to drill all the way through the broken bolt and spray some Wurth Rostoff up into the hole.
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