I've used an imco for a few years now, what you need to do is pack it with extra cotton wool until its quite tight. You'll find they last a lot longer on one refill then, mine lasts at least a week and is used 20 times a day
Mine - I have loads around the house (make great birthday/xmas presents) - tend to last about a week, ,with, again, 20+ lights a day. I find them much more fuel-efficient than the Zippos, about the same for effectiveness in the wind, and the "pull-out match" thingie is brilliant, much-used when fire/stove lighting. I keep a spare flint above the spring, another in the cotton-wool. Having used them for over a decade, I have yet to have one break on me. When filling up, keep gonig until the surface fuel doesn't sink into the cotton-wool any more - many people tend to wait for the first "glisten" of fuel and then stop filling. Give it time!
Conversely, I have never managed to keep a turbo-lighter - of any brand - working effectively for long.