Carb Tear down, please look, harbor freight ultrasonic cleaner

Hey guys, couple of things.  I tore down my carb this weekend and ran it through the harbor freight ultrasonic cleaner with some lestoil and hot water.  What a great little machine. See before and after pictures.  Also, I noticed that this piston has worn a groove in the brass.  Is this something to be worried about?

 

Worn groove

worn.jpg

 

Before

before.jpg

 

After

 

after.jpg

Not sure about the grove in the piston but I am impressed with the HF ultrasonic cleaner's work. I wrote that off in the junk category of HF products, but perhaps I was mistaken.

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