Park Tool RC-1 Press Fit Retaining Compound - 10mlPark Tool RC 1 Press Fit Retaining Compound 10ml. Park Tool RC 1 is used to prepare non threaded parts such as bottom bracket cups sealed bearings and other press fit components. RC 1 expands and hardens as it cures filling gaps and ensuring secure installation. 10 ml (0. 34 fl oz) bottle Competes with Loctite 680 Not recommended for threaded applications NOTICE: When retaining compound or threadlocker is used on carbon fiber frames or components