Do TK Maxx have such complicated to make pieces? 'Blob' is just the piece of glass used to attach to a metal rod 'Punty' for shaping and finishing, just not ground off in this case.
It is made by blowing clear glass, rolling in glass powder, blowing into a cog like dip mould, twisting. Repeat last three steps twist in the other direction. Covering in clear glass, Blow to size, swap to punty open out and dish. Apply rim, final shaping.