I let the compression of the engine find top dead center for me, Turn the piston all the way to the top, Install the wheel and rotate back and forth real lightly, you will see that most engine have about 10-12 deg of lose play, Center of that lose play is top dead center.
And the results is yet another pilot who has no idea where his timming is actually set but thinks its set at 28 degrees and cant understand why it runs so poorly or has to adjust the timming to the mythalogical sweet spot which is where it probably would have come out if the degree wheel was properly set up to begin with..
I dont know why this is so hard to understand.