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I used a scratch marker, it was perfect. Or Just get any round piece of steel of about 6mm and sharpen it, a nail could do too. The X cut may grow after you ram the valve in, as in Dammit's pictures, a round hole is way less problematic.
Another thing that works for me is tightening the valve a bit more as soon as it starts hissing
Netakure
yeah I know I just never thought of doing it. The roundness of the hole pleased me.
I've done the 'X' cut, used a screwdriver poked upwards through the rim and more recently just jammed the stem upwards through the rim. The later two probably wouldn't work with yellow tape though.