You can only insert the dowel pin into one of the flywheel's holes. You should be good to go if you lock the cams and insert the flywheel pin so that the small handle almost touches the bellhousing. To secure the 18mm socket wrench in place, give it a little wiggle, but be careful not to apply any force. You can tell when the flywheel pin is in a recess rather than a hole because the small handle on the pin is far from touching the surface of the bellhousing. When the flywheel pin is placed, there is one way to turn the crank such that all of the pistons are even. While trying to locate top dead again, I hope you didn't bing any valves.