Cool. I like the patina. You can see where a hand has polished it. And sweat pitted it. There is soul in there. Indigenous masks only have value they say, if they have been danced. This tool has been danced.
I got this and a bunch of tools from this old engineer before he died.
 
Sometimes hub-drive bikes come in that have an inboard pad adjuster that is not possible to access. 95% of hub-drives with mechanical brakes are out of adjustment and barely work. So, what is to be done? Here I drilled the rim of the motor for access painted it black and then put a white dot on it to quickly find the access port.

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I am not sure what to think of that. It works and I doubt it compromised the hub, but I probably would have taken a different approach if it were my bike. Most likely I'd pull the caliper off and adjust it while waiting for the new hydraulic brakes to come in.
 
Bend ball end allen key also does the job in my experience
In some cases it is higher than 45 degrees and won't work. The customer is 135 kg and lives on a hill. He couldn't stop. I have shown him how to adjust the inner pads and the notch will make it easy. The ball end 5mm hex worked on his other bike.
 
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