Hiya. I just got the hot end pack in, and theres an extra part that I dont recognize. Yes there are several references to the little washer, but no instructions on where it goes. It only fits over the threads of the nozzle, but in so doing, only leaves 3 or 4 threads for the collar to screw onto. That concept doesnt agree with me, especially when you consider it pushes up against the spring by that extra 2 or 3 mm. How about a little help there? Thanks