Nockenwellen- und Kurbelwellen-Einstellwerkzeug für BMW R1250GS K50, R1250GS‑ADV K51, R1250RT K52 K53 K54, TDC- und BDC-Positionierung - AliExpress 201355758
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Just noticed these cam-holding tools on AliExpress. Needed for valve timing check & adjustment, but I don't think they're needed for valve clearance adjustment.