Hey dude i just bought a summum i was just wondering if i could get sime help actually. I bought the frame at its slackest and i want to make the head angle at its steepest so all i have to do is rotate the headtube cups 180 degrees, but how do you do that? The cups have 2 little grooves i was wondering if your meant to use them or if theyre just for lining it up correctly?