Finally got the HD bubble pack warranty replacement bump head apart. The two halves fit so tightly no lubricant , however fine, can allow easy access. A guy on youtube pried several mating radii apart and ground down some areas with caveat ( my take...too much and the halves will part in...
The basic unit is good so far , tearing into wet, thick weeds as well as any other 2 stroker. The point of the thread is how far off the mark Ryobi went apparently trying to appease those who cannot rewind the old style bumphead with 20 feet of line. Concentration on that set up a spaghetti...
My first trimmer was a 725R and a great unit it was. Then a Craftsman which just died so tried Ryobi again. The unit is ok but the bump head is a hand ( and wrist)-wringing problem. Is this new design to simplify owner operation? I think most would say all is well until that first line jam...