Here’s how you can fix the head problem permanently and without slathering Minerva in lube. See those nubs on the left and right in the socket? Those catch on the underside of the little headmaster head and are what prevents it from pulling out. Cut one or both off with an Xacto. I removed the right side entirely and left a little of the left side. The fit is perfect now. I feel like I could cut both off entirely and it would still fit great, but I wanted it to still be a little tight to compensate for the wear over time of placing and removing the head.