20 Most Recent Bosch MUZ4MM3 Food Processor Questions & Answers

There is a separate discussion on this on fixya. The plastic piece should automatically "retract" back into the handle when you attach the processor. Some have removed teh plastic piece and reports it works then, but you should not need to do that.

I actually got tired of trying to figure it out and just unscrewed the bottom and removed the plastic part. It works fine now!
I had a screwdriver to use with a mobile phone, I think its called t9 or something.

web search-bosch muz4mm3 parts-about 4th site down

Only places I can think of is either ebay or amazon.

You have to align all the parts so that the safety switch allows it to work