Does your blender coupler look like this?

For sale is a genuine KitchenAid (Kitchen Aid) replacement part for blenders.  This spare part rubber coupler is made by Whirlpool in the US for Kitchenaid.
This clutch/coupler will fit all KSB3, KSB5 and 5KSB5 models.

The rubber coupling is designed to break if the blender is under strain.  This will often happen if the food being chopped is too hard or being chopped at too higher speed.  The part failing prevents the motor from more severe damage.

The coupler/clutch has six rubber teeth which grip the underside of the blade in the blendering jug.  The clutch is secured to the blender spindle (which is made of steel) with a reverse aluminum thread.  i.e. you turn clockwise to undo it which is the opposite to normal.

There are two ways to remove the old clutch.  First you can use a thin 7mm spanner to grip the flats on the spindle under the coupler then turn the coupler clockwise.  Second you can use a large flat bladed screwdriver to gently prise the coupler off the spindle.  If you use the second method the aluminium thread in the coupler will be stripped as aluminum is softer.  This is not a problem as the coupler will need replacing anyway.  Make sure you clean off any pieces of aluminum left in the thread on the spindle.

This item comes sealed in an original bag with instruction on removing the old coupler with a screwdriver.

I send items daily, however the time I get to the post office can vary from day to day so it is possible I may not despatch until the day after you order.  I do sometimes post at the weekend but usually orders from the weekend will not get posted until Monday. 

I recommend you use a spanner to remove the old coupling.  When you use a screwdriver you can leave swarf (metal shavings) in the spindle thread which can be sharp and if not removed may prevent the new coupling from fixing correctly.  I have found a suitable spanner which I sell with the coupler.  This is available in my store: KitchenAid Tools

axe coupling drice blender kitchenaid    Instructions are also provided in French.