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Presumably a Russell Hobbs though you did not say; the blender is obsolete and parts hard to source,furthermore given the price of comparable parts it would be cheaper to buy a new blender. I hate it when that happens.
Check the blade assembly if it is loose tighten it up. If it is worn out or cannot be tightened up then buy another jug complete with blade. If it is the glass jug model then the blade assembly is available without the jug and they also have a replaceable seal at the base.
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.