Try this: take out No.1 spark-plug, get a small piece of newspaper and screw it into a wad a little bigger than the threaded section of the spark-plug.
Take this wad and screw it a small ways into the spark-plug hole, firmly but not TOO tight.
Get into the car, twist the key and 'bump' the motor over one compression at a time, eventually you SHOULD here a small 'pop!' as the newspaper 'plug' blows out, that's when your just about on TDC.
You may end up a few degrees past TDC but at least you'll know that if you turn the motor over backwards to get the timing marks lined up you'll be on TDC.
Hope I made this clear!!!
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