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Just completed my second camshaft replacement, this time on my 445. We did my dads last year. Adjusting the valves with a 10mm wrench and a tiny crescent wrench isn't working great.

Can someone help me with the right tool to adjust the valve clearance? I think it is a valve tappet adjuster tool. I know the lock nut is 10mm. Does anyone know the size of the square peg on the adjustment? Looks like the common sizes would be a 3mm or a 4mm.

Any advice or links to tools you have used would be great.
 

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Must be different than my 345 it had a screwdriver slot with the hex end so I could use either or.
 

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Must be different than my 345 it had a screwdriver slot with the hex end so I could use either or.
I saw a YouTube video on a 455 and it too had the screw driver slots. The 445 must be unique.
 
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