i just got a brand new oil rig, my first one. i have a badly formed glass nail and i keep hearing it crack. i planned on using it just until i could get a good one, but am i safe to use this or could it damage my piece to do so? i am using a cheap butane torch. attached is a picture of the rig itself. if you need to see the cracks in the nail to know how cracked it is i will take one. any other tips would be appreciated.