What....you never heard of the Flowbee?
I’ve been using a Flowbee since 1993. Never had a breakdown or glitch not dull blades. Still works like a charm. Only issue is using electric clippers and backing up to the BR mirror while hold a small mirror and then telling my brain which way I need to hold the clippers to get a straight cut across the bottom of the hair line. I’ve been asked a number of times who my barber is. This gizmo has paid for itself many times over.
Never heard of it.
At the dorm I was often enlisted to ‘trim hair’ with a single edge razorblade laid against a comb. Works like a charm, for certain hair styles.