I have no idea what to call them, but they align the valves and theres a slot for them to fit in each casing. On my MW 2145, they are starting to wear out, and I was just wondering if they sold replacements anywhere, or if I would have to call for maintenance.
I had the same problem with the valve guides on my melton 2145. went to my local brass repair shop and they ordered them for me and did not charge me for them!!
I even learned the german name for them: "ventil führung"