2008 Honda Aquatrax ARX1500T3/T3D factory service manual, Page 244Get this manual
ENGINE REMOVALIINSTALLATION Install the stopper collar and tighten it by hand until it is fully seated to secure the alignment shaftBe sure the alignment shaft end is flush with the stopper collarCOLLAR
STOPPER COLLAR Measure the clearance between the drive coupler and coupler attachment at each coupler blade by inserting feeler gauge, and make sure the coupler is fully seated on the attachment evenly (the maxim reading of the clearance is within 0.2 mm)
COUPLER