New Trimmer Head for Robin NB231?

[TheLawnBoyMan]

Ok, I have an old Robin NB231 Trimmer/Brushcutter. It is pretty old, and it is a small company. It is commercial quality. Anyways, it is a pain to reload line, and put more out. I am in the market for a new head that is a Bump-Feed, and most importantly, fits this model. I have found a trimmer head that might work:



OREGON 55-140-0 MAGNUM GATOR HEAD 4IN


Would this fit/is it good?

Any help would be greatly appreciated.
Thanks