how replaced th square drve in my oster blender?

diagram of oster mixer/blender Regency model (think they say 9000 series)?

How can I fix my Oster Fusion Blender?

Oster Kitchen Center. How do I replace a gear in the mixer arm?

Oster Designer Kitchen center(#5510-20a)?

Replace complete blender part for Oster Kitchen Center Regency model?

Is any service, lubrication necessary?

My old oster kitchen center (Regency) is not working?

oster regency kitchen center?

does anyone have a oster kitchen center food processor?

Oster Kitchen Center parts?

Can I replace the plug?

How do I replace the Main gear in Oster Kitchen Center mixer?