You are right, also the vivi novas are notorious for pushing that center pin down. This has been beat to death but I'll say it once again, DO NOT overtighten, torque down, pile drive your head onto any device, you just want to make a connection with the pin, don't leave it loose or wobbly though, just a little common sense, many that are new will overtighten their head/atty and it will be nothing but problems if you do this in the long or short run. Just a little friendly advice.