Barrowing loads

Hmm... Ive been told the chance to get a barrows item is 1/12 ish, but seriously, ive done like 15 runs still no item (not even BOLT RACKS)... But dharok hit a 51 on me =O.
Oh, btw, I did another clue and got a rune battleaxe, a rune dagger, a rune pickaxe, and a black d'hide body... =( no zammy pages.