looking for some advice...i'm in the process of building up a new frame. the head tube is much smaller than on my old bike, and i can't get the stem in as far as i would like. when i skid or stop the stem flexes quite a bit. it's an sr stem (sorry for the phone pic). can i take the fork out and cut the tube down a bit with a hacksaw myself? if so, how long does it need to be- that is, how much actually inside the head tube? are there other stems that are shorter? i have a nitto too, but it's even longer. is the flex maybe just due to an old stem? thanks all.