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Generally speaking, belt tracking issues are usually due to one or more of the shafts that support the pulleys not being perpendicular to each other - this applies to everything from treadmills to fan belts. Check and correct if possible: that the motor is securely mounted in the housing and that it is not installed crooked; and that the shafts aren't loose or have sloppy side to side movement. Belts should be tight - but not overly so.
You have already found what is the problem the blades.
The blades after a lot of working hours with ice they have mainly three problems.
One the sharp adjes have created a lot of teeths and are not so sharp any more so the blending is not smooth anymore.
Second problem they have loose a title so they have move from corect place some milimeters and this change the wave motion and again the beleding is not so smooth as before.
Third the blades are secure on an axis which is located in two bearings which have een wearing out so the rotating motion of the blades again is not so smooth as before.
So if you are not able to fix the blades kit or to find someone in your area to do it profetionaly and cheap one good idea is to buy a new blades kid.
The coupling bush wear out in due time and must be replaced. if there is a wearing detected it must be changed or it will result in failure of the bush/ bearings of the motor and jar. You will need to remove using anti clockwise direction, Get the correct spare part from the dealer to replace. Good day
Not usually is the short answer. If you can find a Sharp repairer who may have that part in, they can repair it. Or contact Sharp customer support services (google the company where you are).
In the UK Sharp have more or less closed down most of their Household Appliances other than their microwaves and it is difficult to source parts generally.