Hi Michel, first, the final weight of the patrem blade is about 87 grammes.. Second, judging welding heat without the sparks can be done by looking at the surface of the iron whilst it's in the fire-the surface will look like butter on a hot day, slightly molten. (the surface looks wet) Never used a gas forge so I can't comment-I've always used coke or charcoal.
As for using a striker, I wish I still had this.......
I have a PDF which has full drawings for building a similar tool, I'm currently constructing one half size, the page seems to be down at the moment so if you want the plans let me know and I'll email them to you.
Regards, Graham.
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