Hi Salsabil,
I've been an easiyo convert for over 10 years. So when I got my TMX late last year I tried making it in TMX and then popping it in the easiyo jar with hot water in the outside baffle. It didn't thicken. Not sure about trying it with no water in the outside baffle. Id be interested in your result if you try it.
I use Valerie's thermomix yoghurt recipe. Google it and there's a nice utube clip with all the instructions.
http://www.superkitchenmachine.com/2009/3581/thermomix-yogurt-recipe.htmlThe prepared yoghurt goes into the thermoserver and I pop mine in the oven (off) wrapped in a towel, as advised by my cobsultant. No one disturbs it in the oven and it stays completely still.
I also use about 100g of skim milk powder to 1.8L of milk as faffa describes in her post here on page one.
Good luck with the yoghurt. Once you've mastered it you'll love it. We eat mountains of natural yoghurt with rice and curries and my husband and kids never knew the difference between easiyo sachets and home made TMX yoghurt. But my wallet noticed.