I did use a John Smiths can a few years back in a similar emergency!
I use 8 to 12 mm on my 300tdi, but check first that the rocker bar studs have not come loose like mine did. If this is so, I cured this by removing the studs completely, cleaning everything with carb cleaner & refitting studs upside down using locktite, as the threads in the head will have become weak, and are better the deeper they go. You will have to meddle a bit with washers to get a good fit for the tappet cover, as the short threads are now to the top, but it cured mine permanently. Before, I had been adjusting my tappets often, only to hear the bloody things a short while later (again). Then the rail broke because of the loose studs, and after limping back to base, did the above & no problems since.
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