Thanks Larry,

In that my first idea I though mostly about strength. EG mixture I found here with iron aggregates was described like machinable, but very strong because of glass fiber (and some additives not so much available). It seems because of very stiff steel tubes, there I not need to care so much about strength like about dampening.

For pure EG construction mold I would not care - it is wooden - simple and no problem I think (?), because still I am interested how it should be for such narrow and long lathe structural base. On e. - it can be in some standard lathe bed shape (?), probably with some reinforcements (?).

Cheers, :cheers:

Peter