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If you can use sch80 or heavier. In fact for 3/4 try and find some sch160 (a boiler shop should have it)

Vise grips ;) Cheap and fast to use, C type and cut them to suit.

People don't seem to realize how dodgy it is Tussock, especially when you start doing bigger quantities.

The reason for preheating the mold is to get rid of moister Spanners. It can be explosive when the molten lead hits ANY water.

Make sure you put a little preheat into them before pouring to get rid of moister.

13 a kilo sounds good to me, they will be able to get the size very close and it saves a lot of hassle for you. ...

DLM - Extrusions To easy.

I wouldn't use alloy, it doesn't handle heat at all well. Carbon steel would work better. Do they have to be totally round when finished?