Concept2 Forum

good idea.

Done

The problem is the instructions on the c2 site quote both imperial (3/16" and 5/32") or the metric equivalents (5mm and 4mm) needed to do the job. Metric keys will work fine - the tolerances are close enough. 4.5mm is close enough to 3/16" to work https://www.concept2.com/files/pdf/us/indoor-rowers/...

Just ran into the same problem. Despite what the instructions say, the correct answer is a 4.5mm allen key. We have 5 metric allen key sets at home and one imperial. None of the 4 or 5mm keys fit, nor did similar size imperial ones. Had to make a trip to the hardware store for a 4.5mm key (that was ...