Ok guys, I have a problem getting rid of the bubble at the top of the needle. no matter what i do I can't seem to get it out. I've tried flicking it, pulling back to let air in in order to push it back out, leaving it for 10 or so mins to settle. Im out of ideas, it always seems to be at the top and about the size of an 'o' on here.
Advice more than welcome.