That time of year again when the stove comes out for a cleaning. I have an insert that sits on stone, but its an old fireplace and the inside of it is all undulated. Every year I have to shim here, adjust there, to get it to stop rocking and rolling. Also, occasionally I have to move it a little to stop the noise from it vibrating. Anyway, its a CB1200 so its not crazy heavy. Does anyone have any suggestions on some kind of fire/heat proof mat I could put under it? Has to be fairly thin,but pliable