Window weights as a source of cast iron.?

[File HandleParticipant @filehandle]

I nearly put this in beginners questions, but felt better here.
My local antique / house clearance centre has a pile of old window weights. From what I have read and remember these can be OK or not worth the hassle. I seem to recall someone attacked the outside with an angle grinder to remove the chilled crust. What are others experience of them ? I understand thicker one are better, but guess its a bit hit and miss.

[noel shelleyParticipant @noelshelley55608]

They were made of what ever rubbish the foundry could get hold of ! There only criteria was that they should weigh not be good cast iron, if your a gambling man you may be lucky but if what your making matters then don’t bother ! Noel.

[BazParticipant @baz89810]

Don’t waste your time with sash wights, same goes for the weight lifting weights, plenty of good cast iron available from our usual suppliers.

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