O-ring expander - GIF

O-ring expander.

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Previously:

https://www.homemadetools.net/forum/...820#post148359

Very reminiscent of the castration band tools used to castrate livestock...

https://www.amazon.com/Tri-Band-Cast...D9DCYSYZTNQ2EW

I guess the only real difference is where you put the expanded ring before you let go....