Ok while the shops aren't open i decided to make a quick fix on it.
First of all i took some Teflon tape and twisted one in a sting other lefted as it is :
Then i wrapped the teflon string on the stem :
After that just wrap the original shaped teflon tape over it to make a nicer finish.
It doesn't look good but it will have too hold until i mend it properly. (sorry about the photo quality)