There should be no free play between the rocker arm and the rod, part 10, except for a 'tolerance' fit that allows engine oil to exist between the mating surfaces.

As a rough test for play, I would consider closing down the adjustment screw by hand on to the top of the valve stem and then feel the rocker arm for play at the back of the rocker arm. It's a very basic test because to actually measure the internal diameter of the rocker arm you would need to remove the cam sprocket and the cam shaft retaining plate and then use a 6mm threaded slide hammer to extract the rocker arm shaft. The rocker arm then comes out of the the cylinder head. It's highly unlikely there would be a problem in the first place.

I think 0.7mm is over 3 times the maximum valve gap. I would re check your timing marks are correctly lined up and the piston is at TDC and then close those gaps to anywhere between 0.16 and 0.20mm, remembering that the gap may change as you tighten the lock nut on the gap screw due to the screws threads being 'pulled' by the lock nut.

For your gap to be 0.7, I would only guess the lock nut had backed off or a previous setting was accidentally set.

Apologies if I have, still, misunderstood your questions

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