i bought this bike used, the end cap on tail pipe was screwed on, of course these keep vibrating loose. so ive got some rivets now and some new packing, i only remember having the packing inside , no tube with holes in it to wrap the packing around then insert, i only seen packing. Does anybody know if all that goes in there is the packing or do i need to try and find a a tube to wrap the packing around before i rivet it shut.