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it is, but i hadn't actually cleaned it, it has been about a year since it was last calibrated.
the reason I didn't jump straight to the grinder was it's been pretty much fine up until now maybe a touch quicker pulling shots. but the adjustment screw needed a hefty turn to get to the correct point though so I expect it recently worked its way to the point where it easily loosened.
Chewed through an entire bag of my yellow bourbon dialling my machine back in after full clean, no matter what I did got instant blonding and shot would be done in about 6s, adjusted every metric until I was on the lowest grinder setting and still no joy.
Re-calibrated grinder and it was spot on again instantly. ffs.