Why redundant?
Watchbitz has then as well and 18 dollars cheaper: http://www.watchbitz.com.au/shop/index.php?_a=viewProd&productId=315
I thought that a rubber ball would do a similar job. Granted, that I have not YET remove a PAM case back. Will the PAM back remover be a must?
While you may get the back off (if it hasn't been tightened fully) there is no way you will get it as tight as it should be when you put it back on. Do it with a sticky ball and it will leak. It won't even be fully rain proof. Sticky balls are not tools they are toys.