Stihl OEM part number 5910 890 2400.
Should of bought Wiha.
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Just buy some cheap 1/4" but driver 'bits' and turn them down or grind them down to make them thinner. Saws like the MS261, blowers and others have fork all room for normal but drivers. Just pointing out a cheap option if you don't have all the factory tools.Fyi the Wiha 8mm won't fit all carb nuts as the side walls are to thick to fit, you need the Stihl branded 1. BTW I have heard Wiha makes the tools branded Stihl as well, but to there specs, also the t27 in wiha brand is longer then the Stihl branded 1.
Well, I do have a couple of T27 wrenches that are worn out from lots of top end rebuilds. Cylinder bolts as you know are tightened down like iron. The screnches with T27 ends don't even fit into the cylinder holes, but I have gone through two of those, one of which I saved by milling it into a flat blade. The fat shank made that possible.There isn't much you can do with a torx driver except grind it to a point and use it for a scribe or something . A T27 would screw a bunch of bolts before you ever wore it out doing saw work unless it were a cheap Chinese made .