Posted 28 September 2015 - 09:40 AM
Well, most times people end up drilling them out from the top down thru the blank. Not easy. Heating up the blank might do it but unless the glue or epoxy is sparse, the blank will fail before the glue warms up and lets you remove it. The blank is e-glass and it can't take the heat.
The two choices are that you take your chances, since they are cheap and try it or ship it back to the seller for new ones. You probably will not have much wasted if they do fail and it if works, you're a head of the game. The worst part of some of the cheaper glass blanks coming out of Japan is the spigots themselves. Rough, length not matching, poor fitting, dirt in the glass spigots,etc.
Good luck and keep us informed what works