Quoted from atwong:
You mean the half circle fork that is a part of the vuk? It does seem loose and you can move it side to side. Should it be more stiff?
No. 99% sure they meant the circled bit.
Mine was kicking out into the left sling and annoying me. Loosened that part, turned it a bit so that it was facing the left flipper more and tightened it back down. Fixed it right up.