Another way is to get a cheap compression guage. You can watch the compression build when it's on the compression stroke. If you go slow, you can even get a pretty good estimate on TDC by watching for the moment that the compression reverses. Go back and forth a bit and you can zero right in on it.
Get a guage with a long hose to the spark plug hole and you should be able to position the guage where you can read it while hand cranking.
By the way, if you can spin your valve stems I'm thinking you either need to adjust your valve lash because they're not seating properly - or you have very very weak springs. But that's a different issue.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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