I have used the Gunson on my hydraulic clutch set up with success,
your right about it filling to the brim though.
You should be ok with extra care and don't go to high with the pressure
what ever you do.
To be sure I also cover the master cylinder and bleeder unit with something just in case.
Will also keep an eye out for another clutch/brake bleeder due to the Gunson getting a bit tired.
Chris.
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