Are you a mad scientist? Who has a Pyrex rod laying around?
I prefer the term eccentric. I have a full glass shop here. I can blow glass, cast glass. sculpt glass and weld glass. I have Borosilicate glass rods from 1/16" to 1 1/2" and tube from 1/4" to 2 1/2". If you are wondering about the syringes I also have a lab here. I have more degrees than a thermometer. I have been using the old GI bill for 40 years on and off for school. They pay me to go. There seems to be no age limit I'll be 67 Sunday I think.