I make them out of copper and brass I also have the steak in version. My steak inversion It's $35 shipped the brass and copper ones are 30 and all of the bushings come with A8 millimeter pen
I can make a bushing that will convert the 9 mm to an 8 mm The bushing is outside diameter 9 mm inside diameter 8 mm I can make it out of brass or copper I do also have some staked in versions. Each bushing I sell comes with A8 millimeter pin