I just found this online this week so we haven't tried it yet, but it looks great. We always tape the tube to the connector, but the pieces get so sticky. My kids have the bard button (flatter than the mic-key), and the connectors don't twist in to the button, they just pop in. Very often they pop out too- and then a huge mess!
<a target=_blank class=ftalternatingbarlinklarge href="http://www.appliedmedical.net/amtclamp.htm">http://www.appliedmedical.net/amtclamp.htm</a>
oh ya- they're $10