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I want to use it to press metal into the correct curvature to for a headbadge so the need the curve really.
I've now found smaller versions, up to 3/4" diameter (think I need around 2" dia) going by the name of swage blocks or dapping blocks so hopefully I'll find what I'm after sooner or later.
M_V-
In that case you can probably manage with a couple of pieces of thick wall pipe, one whose id is the same as the head tube od. Cut this in half length wise and press into this using another piece of pipe of the requisite OD. Unless you are using very thick material for the badge then you may need something very robust.
freezing77
Can you not use a standard V block, the usual method for supporting round objects in machine shops.