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the glue is at the bottom of the stone, maybe a bit on the sides. So you need to heat the bottom only. If all else fails and you have had no luck, then just pour lots of water. The box will probably...

I think that's more with J-nats? As I tried to say, best to keep the level low. You could lower the temp if you like, or if you're really worried get the hairdryer and just heat the bottom. It should...

I think they used hide glue in these cases. I removed mine very easily - just put some boiling water in a flat pan and added the stone. About 5 minutes later the stone was out. Keep the water level...