The Bafang BBS02 package includes a thumb-activated throttle which, like the display, should clamp onto a 22.2 mm handlebar. The one on Mary’s bike fit neatly at the end of the left handgrip:
There’s no similar location on a drop-bar bike that doesn’t get in the way, particularly on my friend Gee’s bike with narrow bars.
With a display handlebar adapter in hand, this seemed less awful than anything else I had in mind:
That’s the front view, so it’s on the right side in front of the handlebar. I think it’s usable with either a thumb or fingertips from a hand on the top of the bar. The handlebar lacks tape, as mounting the brake sensors poses a challenge.
The view from the rear isn’t too revealing:
Not too unsightly, but definitely not a standard setup!
The Smell of Molten Projects in the Morning 
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[…] fat “harness cable” from the motor to the four handlebar components (two brake sensors, throttle, and display), with a lump covering the junction where the four smaller cables emerge. Securing the […]