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No rope and no trick needed, since when the piston is all the way up it will hold the valve(s) in place, almost closed.
Just spin the crank about one 3rd of a turn past the point where the intake valve of that cylinder has closed. That should be your TC, more or less.
To confirm, use a lever...
I'd replace the spring and eventually do a compression test first, before going through all the work of pulling the head.
(No big deal to replace a spring, with the piston at TDC. It's a one-man job and can be done with no special tools.)
Yes, the valve may have touched the piston occasionally...
Aha... so I wasn't right when I said all 12 should be intact... 😕
I only based my assumption on what you said initially, the motor running "solid" - and the fact that a cylinder with a shattered valve spring would make an engine run rough and under-powered, at least...
To me that looks like a piece of a valve spring. If it's hardened steel (a file doesn't grab) and little over 3/16" in diameter, then it is...
Now, for the second part of your question - if the first is confirmed then you may want to pull both covers and make sure all twelve springs are intact...
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