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Yes, it's a replacement wheel for brass/copper pipes cutter.I hope it won't get dull quick while cutting thin sheet metal.The first one was from bathroom tiles cutter, but it didn't work well.
I think I've answered your question in response to Laspiblov question below :)
It's an standard procedure especially in aircraft or racing engine maintenance.After opening the filter you gain access to the filter material and you can inspect it for any signs of metal pieces/filings and assess internal condition of the engine. If any, the metal particles will be small, that's why it's important to not contaminate the inside of the filter while opening it using i.e. angle grinder.
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I have never tried to solder steel, but I think it would be possible.Making the rose from copper sheet pieces soldered together would be quite easy. However, if you don't have access to the welder, I would consider using some two compound epoxy to glue everything.Also, have a look at this instructable https://www.instructables.com/id/How-to-Make-a-Metal-Rose-Without-Welding-and-Forgi/
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Better not, otherwise we're doomed :DPS. There is a short clip with the arm in motion in the last step if you haven't seen it.
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