I make and sell stainless thread caps, along with my other cnc machined products. I have most of the common thread sizes and nominal diameters in stock. Not knurled, so they can be custom turned on the outer diameter if required, however normal practice is just to fit a thread cap where the diameter of cap is very slightly larger than barrel diameter at the junction. $20 each plus courier bag. I have them listed on trademe, but you can also contact me direct with details of what you want. ( save me some paperwork and TM fees!)
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