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There is a collar on the base of the jar that screws onto the jar. You will need to unscrew the collar and fit a replacement blade. make sure the seal is replaced with the blade and the collar is screwed back securely.
See this link for the parts of the blender. CUISINART CANADA SmartPower Premier 600 Watt Blender CBT 500C
Also see the product description for the blade.
it could be metal fatigue from the blade. Try a different blade and see if it does the same. If it is still rattling it could be your blade drive needs to be replaced. Sometimes the screws that hold the blade drive in place come lose or striped so you may need to check them.
Hope you have solved your problem by now, but put a flathead screw driver in the bottom of the blender to hold the blender shaft in place then turn the gear by hand or with a plyers and it should just screw off, it is reverse threaded...
Try bonding the sheared portions with Araldite. Once it is set try slowly to unscrew.
OR if you can make a little nich in the embeded portion so that tip of screw driver can fix it. Then it should be easy to unscrew the sheared portion.
Otherwise no other alternative but to replace the attachment.
Look at the underside of the blade shaft. The metal wing nut on the end of the shaft secures the blade assembly to cream coloured plastic blade base. The wing nut also transmits the drive from the rubber coupling on your blender to the blade shaft. The wing nut has a LEFT HAND thread. The left hand thread ensures the blade assembly does not unscrew during normal blender use.
Firstly disassemble the blender blade assembly. Place a folded tea towel over the blades and hold the blades firmly. If you do not use a tea towel you may cut yourself.
Grip the wing nut with your other hand and unscrew it CLOCKWISE. Remove the wing nut. You can now remove the blade from the plastic base.
Put the blade assembly in the new jug and offer up the plastic base from under the jug so that the blade shaft protudes enough for you to install the wing nut.
Screw the wing nut ANTI-CLOCKWISE to secure the blades to the plastic base.
Do not over tighten the wing nut; you may have to replace your jug again at some point.
what you need to do is hold the blades with a towel to protect your hand, then, use a visegrips needle nose to grab the coupling (pushing the guard down) and twist it loose. It may be very tight, when I loosened mine, the plastic portion of the coupling pulled off leaving the metal "nut" tight to the shaft. Either way, remove the coupling/nut in the standard "lefty loosey" direction. Many thanks to the people at pleasanthillgrain.com for walking me through the process. Blessings to you.
if the motor is running and the blade is not turning here is a rubber coupling that has probably broken.the blender will need to be pulled apart and that part will need to be replaced . it is designed to absorb sudden shocks if something hard is hit and has broken rather than burning out the motor. there are two other torx screws holding the rest of the plastic parts after the switch assy is removed by uncliping it .