stem

Guys, What tool to I need to get the top yoke steering stem nut off my 2000 RSV Mille R? It has lots of small holes what looks like a 15mm allen key?...Lofty

just wondering if anyone has one kicking about in good shape.. have managed to ring mine on the millono r :(

HMMMM. I have a very slight oil leak after changing my oil (first time I've done it on this bike). I managed to get the bottom drain plug back right first time, and the extended filter cover right on the second attempt (didn't tighten it enough the first time as I didn't want to break it! ) but...