TM 10-5411-232-13&P CARGO BED COVER (CBC) M105A2 TRAILER, TYPE II   0019 00 CBC SHELL ASSEMBLY INTERIOR MOUNTING INSTRUCTIONS Rivnut Fastener Installation The purpose of the rivnuts is to provide areas for hanging any number of items within the CBC. Rivnuts may be installed on any of the internal stiffening ribs on the CBC’s sides or ceiling.  It is best to use 5/16 in. flat head rivnuts, P/N 37-115 (B.F. Goodrich). a.    Drill a .490 in. - .500 in. hole, .850 in. deep into the rib of the CBC. b.    Insert the rivnut.  Screw in C-722 wrench type header and pull the rivnut by rotating the head with   an allen wrench. c.    Remove tool after installation. END OF TASK 0019 00-6