It probably can but it is designed to cut wood and cutting metal would probably shorten the tools life.
Yes it should work for cutting lead however the blades will most likely dull quickly
Yes it is replaceable although I haven’t had to change mine yet I bought two cutters at the same time
I wouldn't try it. See the pic I posted. That was 1/2 inch.
i just bought 1 online "Feb 2018"
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yes i ordered from home depot in yulee florida