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http://www.dcrainmaker.com/2014/05/garmins-spd-cad-magnetless-sensors.html
I think this is newer, looking for a TLDR version of the DC Rain maker
bitterbuffalo
@Cranky
I've got the one that came with the 510 in summer 2013 and it's OK. The o-ring seal on the battery compartment of mine is tricky to resit though. Is this the one your referring to or is there a newer one?