I have worn out more manual pencil sharpener blades than I can count. I still use manual sharpeners for my colored pencils. But for graphite, I use these two:
The Boston Model 19 Electric Pencil sharpener. The Boston Model 19 has survived the move over the years to two new office buildings and has outlasted the original employee who requisitioned it. It still does service for one person, me, in an office of 3,000.
The X-Acto Model 41 Electric Pencil Sharpener. The X-Acto is my home model. Both have auto- stop. The “auto” is questionable, because one can force on if desired. I apologize in advance if I offend sensibilities here, but if one is serious about using pencils, these are heaven sent. They both create points as long and as sharp as the KUM Long Point sharpener makes. A worn out KUM is the enemy of soft pencils. I stopped fretting over the electricity usage when I realized I was using just as much to turn on the spot light to clean out jammed hand sharpeners over the trash bin.