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Hi - need some advice please. I have a Shindaiwa Pole Saw - which I'm using more than I expected at the moment. It's in good condition - and I try and service it more than specified. Yesterday I encountered a problem. It jammed-up when limbing a tree. Turned-out that the chain had tightened-up so much when running it simply stopped moving. The funny thing is that if I loosen and adjust it - it's very loose on some parts of the rotation and tight as tight on other parts. Tight means really tight - and loose means almost loose enough to jump-our of the groove. So I removed the old chain and replaced it with a brand new one. Same issue. I removed the bar (which is also less than 2-3 hours old) and cleaned it out. The end sprocket rotates beautifully, there are no bends or apparent tight spots and the chain groove is clear and free of any burrs. The oil pump is working and everything seems well lubricated. I then looked at the chain sprocket. It's steel, hefty and looks in good nick. I do have a slight suspicion that it may the culprit - but can't detect any run-out by eye. There's nothing trapped in the teeth of the sprocket - and no discernible damage (it actually looks like 'new'). I took it off and re-seated it - and there was no improvement at all. That just leaves the shaft from the gearbox to the chain sprocket. Again, there's no play in the that - and I can't detect any run-out. Now thoroughly mystified. So my question is this. Anyone got any suggestions as to what it might be? I have seen that there have been some other posts about tight chains on Pole Saws - but that seems to be down to lubrication issues - and in my case it's tight spots and loose spots (if that makes sense!). Could it be that I'm overlooking something? Interestingly this is the only real trouble I've had with Shindaiwa. My perspective is that the stuff they make (made?) is really top-drawer.