Perhaps there is something I don't get but as I understand it you have to lock the cams, at least, in the opposite head to the one you are working on. Personally I lock both.
You are right, on the 5 chain engines you only lock one cam on each side with the shorter tool.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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