Okay ... I see punch mark ... hehehe ... its dark, the mark is at the bottom when piston is TDC. One question ... which TCD, combusiton or exhaust? Does it matter?

I noticed that punch mark is at the bottom only just as the exhaust valve is about to close AFTER the exhaust cycle. Means when mark is at the bottom the oval knob has just passed the push rod, its not directly below the push rod.