You’re correct. I did find a supplier (or so I thought) but when received were not the right specs so I took the link down. I’m still searching for that one. Luckily, From my discussions with fx- that is the least replaced rubber part. The most common are the breach oring and the ones that slide on the barrel to keep it aligned.
I've since found a couple of potential suppliers of precision ground nitrile rubber balls. Found them to NMR 70 and NMR 90, but only from suppliers that require you to submit a request for a quote. Only one place had anything "off the shelf", so probably a relatively high priced minimum purchase, but I'll check it out. Good to hear they don't require much replacing.
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