[Floorkasp]

I am planning to give making blown glass ornaments a go.
I have blown boro tubing before.

Any advice on how to finish off with a loop? Is there no chance of creating a vacume?
My idea is to first blow the bulb, attach a punty, then shape the point into a loop, remove the punty.
But if it is still too hot, and I close the point to make the loop, will I create an implosion hazard?

I will be using boro frit as well. My kiln is very small. My idea is that the risk of cracking is pretty small with hollow forms, so that they do not need to go into the kiln but can air cool. ( and batch anneal later). Or am I then setting myself up for a cracking mess?