A screw was lose near the top of the handle on my roller-carry on bag, where the handlebar joins the adjustable 'sticks'-part of the handle... to put it in rather unprofessional terms! But this mean little screw popped out one day after I'd been rolling around town and only noticed a while later.
When I got to work, I found amongst the fixit kit a screw that was the same size, so I screwed that back in as a replacement. Good as new! ...or so I thought... The handle seemed a little stiff, but I gave that up as being something to do with a nice new screw that wasn't lose anymore.
Pushed the handle in and went about my daily business (it sat under my desk all day, you know what I mean). So it wasn't until after all this when, at home time, I discovered that the handle won't extend up again. Just carried it to the station, but kinda beats the purpose of a bag-on-wheels.
What's the best way to fix this sort of thing? Tug and pull and tug and pull and wiggle it free? I don't believe anything's jammed, though not really sure (certainly not the screw, that I do know). How fixable are handles on roller-cases? Where can one buy a spare 'handle-kit' so as to pull out the old one and replace it, without replacing the whole bag itself? Can you?
No, it's not a fancy bag with warranty or anything. But it's fairly new and hardly gets used. Ought I just to buy a new one? I like these things for inter-state trips. (First world problems, hey!

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Any suggestions and helpful tips would be much appreciated.
(Am I making sense? Let me know if I should elaborate on this with better descriptions of the problem and a picture?)