Finally opened up my Helix to lubricate the pedal... ...and found that one of the shoulder washers (the cylindrical ones that go around the bolt, with a perpendicular flat section) had actually broken.  Where the heck does one get replacements for it? I don't even know what precise size it is as it seems to be metric, so I can't just order it online. And FullCompass does not have them.   Help!