Yes, i read the negative revues RE glass fit, broken when forced. So the first thing i did was lube the orings & put the end caps on the glass. It was perfect fit, smooth. Then installed on my R91, i just pushed fluid into tank from the bottle. Little messy, pushed juice past the upper o-ring. Vaped the 1st tank, then last night tried to refill tank with a syringe, the glass is 50% over the fill hole. So its not very friendly to refill. But since its a test menthol fluid, i do not care. So far I really like the glass tank. Let me know how the replacement tank works out.