Well usually Chas I start fiddling with it to do it and if Pete sees me he grabs for it so it makes no difference ... I shall have to not tell him I'm going to do it and do it in the bedroom in secret LOL I do have severe difficulty actually getting my one hand to slide the thingy back enough for it to pop out and to get the new one 'home' and slide the thing back, simultaneously. This is with no black top on by the way - so with that there, I'm just not sure. I wonder if I'm trying too hard - I mean the cross markings aren't easy for a finger to grab onto and my nails are so soft they bend if I try to do anything, eg daren't run my fingers through my hair when washing it or it's still wet, else it cuts the nails, ie vertically down from the edge. If I catch the edhe on anything, a layer will peel off the top. Dextrous I'm not, never been able to rub my tum and pat my head, either LOL More trouble than ever since I've stopped chewing them, they just get in the way more and always need the broken bits removing. Gah!