... in front of the cocking block. One comes on the cocking latch side from the factory., but their is a second hole on the opposite side of the block for what seems to be for another ball. I went ahead and popped a second one in and now that cocking latch snaps shut with authority now. Seems like it should’ve came with both balls attached it’s so much better. I believe this is an age old subject matter because it seems to me I read a tread somewhere where black rubber balls an impacts were being discussed but I was impact ignorant back then. So, where there any downsides to installing a second one?