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Tom here are a few tips:
By removing Plug # 1 and shining a small flash light into the hole, it is possible to see the top of the piston when you are at Top Dead Center.
Similar to what Mitch said, you can use a coat hanger through plug one and feel where top dead center is.
If you remove all of the plugs it will eliminate the compression making it easier to crank and find the mark.