Equivalent TL-BR51 Arrived

A mysterious organization sent me an equivalent to the TL-BR51.
DSC07930amx9.jpg
The top image is the original,
and the 3 pieces below are equivalents with the same material, thickness, and size.
The right one is Hairyo-san GT.

The other day when I was adjusting Anchor's mechanical disc brakes,
I used the original TL-BR51.

DSC07931amx9.jpg
In my previous article about the TL-BR51,
I received a comment asking,
"I'm not sure what material this tool is made of,
but couldn't you make something similar yourself?"
but that was beyond my abilities.
This tool is made of some mysterious material that can withstand years of use.
If I only needed it for one-time use, I suppose I could make one, but...

By the way, the regular retail price back when you could easily buy them was 88 yen per piece, before tax.

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