It was only when they went to the same design as the Petromax 900 that the glass size changed. This version of the Optimus 100 uses the same size glass as the 200, but as Assel says, it need the hole. I use a syringe and a bent needle to get under the glass to fill mine. One day I might find an original glass.
I made in a 300 glass a hole. Didn't fired yet. It is a borosilicate glass so it should resist but i don't know what new tension i made in the glass.
