I have a mid 90's mountain bike that I'm using as a bad weather bike. I can't seem to get the headset adjusted right. If I get all the play out it, then it seems too tight. If I make it spin smoothly without any obvious movement (grabbing and shaking the stem), it shudders when I hit the front brake. It did have 22 caged bearings before and I replaced them with 25 loose bearings. Could that have something to do with it? So I basically have two questions: 1. Is there something I'm missing here that's keeping the adjustment from happening? Is the headset just worn and I need a new one? 2. I have seen a threaded cartridge headset from Shimano. It's the only kind I've seen. Is there any adjustment needed there or is it just tighten and go? Thanks in advance for all the help.