Well, my TM2 has a broken glass sleeve. I was going to send it in, but then realized how much it would be for repair (not warranty) service and shipping from the US. It's about half the price of the unit itself.
I don't think I would have too much problem replacing this upper glass with the upgraded metal sleeve. Seems pretty easy.
My concern is the lower glass sleeve around the heater. I don't know if it's broken, but if some of my clumsy drops caused the top glass to crack, then I would guess the lower might be cracked too. Here is the issue, because this looks like a much more complicated repair to prevent further damage.
After reading some past posts here, it looks like the biggest issue is loosening another screw, besides the long tork screw, that holds the top plate in place. Looks like the lower sleeve is still glass in the non-PH models. Has anyone had success in switching out both sleeves without damaging the unit?
I would just replace the top glass and call it good, but I worry about breathing in glass dust if the lower sleeve is broken.