Hi Folks, we have had this glass available for some time now but lately we have gotten a couple of reports of too small ID for tubes on them. Does anyone have this device and calipers that can measure the metal portion that goes into the glass tube so we can nail down a minimum ID for this glass? If more than one can do this even better as it may show how well the maker is holding their own tolerance. I sometimes wonder when we get these odd dont fits if there might be a slight variation in the devices themselves that would lend to some glass running too small. Thanks in advance for any help with this one.