I have a machined piece which I need to replicate. It's made out of a silvery metal, probably some form of cast iron.
Its density seems to be in the 7100kg/m3 region, although it's hard to be precise as my kitchen scales only measure whole grams or 10ths of an ounce. 7100kg/m3 also puts it in the cast iron range, or maybe its "white metal", or something similar...
I've attached a picture of it. It's harded than brass, but seems to be softer than "regular" steel, although it's hard to tell for sure.
Unfortunately, I can't damage this example, so I can't put it on a grinder, or on the lathe for example. It's part of a regulator for a Petter stationary engine - beyond that I know nothing about it. I don't know if the weight of the device is critical, I assume the piston bore is critical but I'm not sure about the length...
Any ideas?