New 20 ounce tumblers available now! Forum donation credit with purchase. https://www.wildguzzi.com/Products/products.htm#Tumbler
That thing looks to be made of Chinesium, which is like metal, but, much softer.
In Forest Gumps voice "My Mama always says, you only get what you pay for ! " Quality items require a deeper reach into your pockets.
That's why some of us own lathes and milling machines.
that is not Guzzi part, it looks like the one Harpers sold for hi way pegs on the stainless mounts. Generic Parts unlimited item