A #26 head is news to me. Might have been a typo or something.
Last I've heard of is the infamous #22.
If you need/want to buy the prechamber tools, send me a private email or PM. I can hook you up with some top quality new Made-in-USA stuff for about what you'd pay for the offshore junk sold by PP, Baum, and everyone else (except MB of course, but after checking prices on the dealer tools, you'll be grateful to get anything for a fraction of THAT price!
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