There's the problem here's the fix. As you can imagine this has been annoying me alot as the nozzle in wonder jet lighter is kaput - If I ever manage to lathe my own all will be well.
**Edit: New steps added**
Step 1: Removing the offending piece.
Grab the flint wheel and pull up, remember this is for clippers, they have a seperate flint assembly, It simply pulls out.
Step 2: Getting down to it.
That's it you need to loosen this a little before you'll get it with your hands, just use a large flathead screwdriver. Take it off by hand after loosening though and hold on carefully in case the flint escapes, after getting the spring and endcap of tip the flint out for inspection.
You'll see one side that's very shiny and most likely worn with a slight groove or some such, possibly a slant, either way this is a bad thing. If this is the first time doing this repair then just turn it around and put it in the tube with the unworn end facing the striker wheel, if you still have a good amount of flint left then you can always file it down flat.
Getting the spring and endcap back on can be tricky, start screwing it in and don't let go of it until it's all the way in, it can go backwards so push down a bit while screwing it in to position, also it'll kind of bump along, don't worry that's just the spring ends popping up and down a bit from being screwed...
Step 3: A more permanent fix.
I used a piece of a small screw as a spacer, you could just put a second flint into it as a spacer, this is probably the best option but my bit of screw does the job nicely and will always be there...