Not as good as i hoped - Accu-Shot Standard height Stud Mount Monopod with Quick Knob

I bought one of these for my dad's 22 marlin after using one of the accu-shot monopods (BT12-QK) that mounts to a pic rail. The Marlin does have a thin stock so that might be part of what is introducing the wiggle. I also think the swivel stud single point of contact just can't lock up tight enough to get all the slop out. Dad ended up drilling a hole and mounting another screw to the stock and with two points of contact it became a lot more rigid.