Welcome Serema.I'm afraid I have never owned a TM21 ( I've owned a TM31 and now have a TM5) so can't help you but I have found the TM21 manual online for you read.http://thermomix.vorwerk.co.uk/wp-content/uploads/2014/06/tm21_manual_en.pdf.
Which country do you live in Serema?This is the website for Vorwerk Worldwide .Maybe contact the HO where you live.They will probably help you.Good luck.http://thermomix.vorwerk.com/your-country/worldwide/