Ok well I’ll try B&Q tomorrow, should I go for M10 then?
Unfortunately no LBS in my town, nearest one about 15 miles.
It’s only one headset (cheapo halfrauds bike) bought a nice FSA one to replace the rubbish they put in, only really bothering because I like to muck around with stuff.
Another question; if I buy an actual press, does it do all sizes of headsets/cups?