I typed Eaglestone Rock mini-guide into google and the first link was live. Failing that I can send you an electronic copy from when I went there last year. The guide has directions, pretty much drive to Merredin, then head North for half an hour is how I remember it.
You may want to check out Ross’s first ascents post on this message board from last year, otherwise a couple of lines of bolts may confuse you as to what route you are on.
Have a good trip, I’ve been meaning to head there myself sometime soon.
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