if you can still fit a finger under your belt, and have access to a key for bathroom breaks, my master locks me in boxer briefs with a thick wooden sock underneath the belt, it creates a padding around the shield. I can't get anything under now let alon
master loves to lock the keys to my belt, so close, yet so far. I can manoeuvre the keys to just brush the hole of the lock, but not enough to get it inside. ironic.