Warrior - I know this is an older post, but this tool has been on my mind lately. My son used this all last off-season. It works pretty well to force them to use the second hand to secure the ball and make a quick transfer.
My question is this - I know a t-ball sized glove is an actual glove with a pocket, but given that it's smaller, would one get the same/similar result using it to field the 12" softball? I've been thinking about having my 14U dd use a t-ball glove for fielding drills. My thinking is that it would force her to get her glove more behind the ball (i.e. lower to the ground) to successfully field the ball. Sometimes she relies on the extra reach her glove gives her to not get as low as she should.