My take on the relevance of the exhibit references, MDF/1 (135) and MDF/100, is that the original exhibit MDF/1 was the 14 spent bullet cases (135) and that once Fletcher realized he needed to introduce a cloth pull through to make the point that the inside of the rifle barrel was blood free, he simply added two (0's) to the end of the original exhibit MDF/1 altering it into MDF/100, to allow him to introduce the cloth pull through evidence as MDF/1, bearing a lab' item number 135...