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Yeah, I have the overpriced stan's syringe. Just squirted some more goop into the front tyre.
Turns out the syringe is overpriced but not but not so overpriced as to have a thread that doesn't allow the goop to piss out over the valve stem.
Still, a pretty minor complaint in the overall scheme.
I have two inflated tyres with an unknown quantity of goop inside. Caffelatex goop at that :-)
If it works, it does look like a painless method of checking & topping up.
https://www.youtube.com/watch?v=SV3ENoc02wE