Bob,
You can salvage the kit by getting a thin rod and poking it down the pen from the mechanism end and locating it on the edge of the nib end located inside the tube and then a few taps with a small hammer will remove the nib, then reverse the pen and using a 6mm rod tap the mechanism out. Then you can put the tubes back on the mandrel and using a parting tool remove the debris. Alternatively salvage the bits that you can and throw it away. Worth getting some spare tubes next time you go to axminster for such eventualities.
As for the lack of adhesion on the blank, I know that others use CA and will argue its success, but I always use 2 part epoxy and I havent had that happen to me.
