I had some top results with stone and glass bearing blocks it makes it a hell of a lot easyer for a glass bearing block I heat up a bottel on the fire and the glass pits and it makes a top bearing block. give it a try just stay well back when the glass is on the fire. I get an ember evey time now ![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)