After some 2000 km I needed to tighten the timing chain on our 2010 Co-Motion Primera. After looking at the manual and few posts here it did not seem to be a complicated thing. However, when I wanted to loosen the screws that hold the eccentric in place I noticed that the OEM TruVativ Elita crank makes them inaccessible (cf. photos bellow, which tried hard to take in level). So, I guess I will have to remove the timing chain and the crank, to actually turn the eccentric to the required position. Not too complicated, but I feel quite disappointed by the necessity of supplementary dumb hassle...

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