Otherwise there was nothing between them in a game of kicking misfires and ruck penalties, aside from OBM gobbling more ball in the second half.
They just couldn't breach the Te Kawau pickets other than Lee Thompson slotting two penalties to tie the game.
OBM butchered an early try with the line open, but in the 33rd minute wing Max Harris broke cleverly to put wing Will Treder over.
Te Kawau scored two tries, one after waves of crossfield attacks off a lineout.
A Kameli Kuruyabaki intercept try took them to 17-11 against the grain, but OBM's toilers Jay Rolleston, Ben Crozier, Matene Ruawai and prop Anthony Guerin dug in.