It doesn't get more complicated than this! Here is the Renaissance Venetian way of making an ornate dragon-stemmed goblet. Pre-made parts are attached using small bits of molten glass as "glue."
A mass of molten glass, usually small and freshly gathered from the furnace. In a team of glassworkers, the bit gatherer removes bits from the furnace, using a bit iron. Bits are also known as gobs.