I cant find a picture of mine at the moment but I use anchor chocks to hold my anchor up on my cuddy deck. They are however slightly different than yours. I'm not sure how the one you shows work exactly but mine are more like this ecxept made out of black rubber
http://www.defender.com/product2.jsp...5509&id=904912
Either way your concern seems to be that it doesnt hold the anchor firmly in place which I dont think is a problem. using the ones I have the anchor is very loose in there but it never falls out of the chocks. you just lift and slide out at the same time . the chocks keep it from moving side to side and from bouncing straight up....its funny though every person who has seen me put the anchor back into those chocks say "you're gonna leave it like that?".....I just say yup .