you say plug I say cap we don't speak the same language ... oops.<br><br>BTW There's nothing wrong with blonds - some of my best friends are blonds!<br><br>The "Bic Round Stic" has a flat-topped plug. I use the barrell and the plug from one of these pens, cut the barrel down to length, harvest the plug from another pen and plug the open end of the cut-down barrel. Then, remembering that I am creating a container for iodine tablets, I swear profusely, remove one of the plugs, put iodine tablets in and then re-plug the open end. So - far it works for me. <br><br>Of course I am still looking for conclusive evidence that this is usable. I only know that nothing else in my kit is picking up the iodine stain and this leads me to believe that I have a decent seal around the plugs. The inside contents may be turning into a gelatenous gue as the iodine reacts with the interior of the pen barrel for all I know.