So, for the most part I am pretty happy with Mega product, but I have noticed that in some lines the hands of the minifigures tend to be a smaller diameter on the inside so, whenever I try and put an accessory in, they would develop thin tension lines that would eventually fracture.
I found out that if I slide a 3 mm drill bit into the hand and turn it a few times to shave a small amount of plastic, accessories will fit in perfectly and the hands will not break anymore.
The lines I have found more prone to this problem are Star Trek and Warcraft, although I have used the bit on random characters from other lines too.
Hope this helps.
