Hey Guy's, I had the same problem yesterday with my 273 baler too! After close examination, i noticed that the cutting blades were really worn down to almost nothing. And isn't it nice that they can't be replaced?! There riveted on. The good thing is, i have had two new knotter assemblies in my shop for the last 4 years just for when this event happened. Bad thing is, i don't have a manual that shows how to remove the old ones and install the new ones. Anyone have a shop manual that shows how to do this? I'm hoping it isn't a major undertaking. I'm mechanically inclined to a point, but not having done this to a baler before i could sure use some help! If you have a smart phone and could take photo's of the pages or copy them and e-mail them to me it would be greatly appreciated! Thanks in advance.