pasting a retzua that is torn
I wrote in a Hebrew blog פורום לנושאי סת"ם: קרע ברצועה that if the retzua was torn half way, and is lacking the shiur of width [1 cm] so that it is pasul, it is permitted in a needed situation (שעת הדחק) to paste [with glue] the parts together, and the retzua is kosher.