Cheers for the replies!
The advantage is “used”, although this is the first time I have had to take it off the rim and only then because the valve came off the old Stans rim strip.
Have done things in a different order, ie, put in sealant, inflate with CO2 put figure over valve then screw in core. Seems to have worked, we shall see!
Have tried the pikey inflator, i think i need some tubing with a larger internal diameter (I’m just using tube off the track pump?) because even with 100psi it won’t inflate a tyre like the CO2 does.
Hopefully I won’t be walking home today…