The Monobeam 50 was never great in it's day nor now .
I have yet to figure out why it exists . Seriously .
The ONLY benefit of a 50 is no carrier break, but who the fawk would put tractor gears on a 50 ? In a toyota okay, something with low power ? Sure...
Tell me it was cost savings and I'll tell you that the extra design/engineering/casting/machine work needed to create the MB50 more than negates the savings .