As for the differences in alloy and steel, I'd agree with Chuck because I have one in hardened steel. However, I bought this in a silly period when I believed in what people told me.
I did a bit of research- using my grey matter rather than theirs- and found that there isn't a lot of difference between something that was made out of 3 bits of steel stuck together with a few bolts and an all singing all dancing thing- except the price. Better still it was possible to get another and another and have 12 stations for tooling- if one wanted to go mad- and keep to the commercial price.
So I did one rather foolish 'improvement' and did a rear tool post- with 3 more bits of scrap. It would handle six tools with one four way tool post on the saddle.
Well, a joke is a joke and along came George Thomas and he had modified a rear tool post casting made for Ian Bradley- the other bit of 'Duplex' in the books. GHT made an improvement and then had a re-think- or two and tilted the thing and made a rear parting tool post with two hss blades.
I got a bit too enthusiastic with the thinner 1/16th blade and I now do all my parting off with a 3/32 one-- again at vast speeds and a slap of lard oil.
So really, it is all the mind this qctp thing- or somewhat prudently, in the pocket.
It doesn't take much to saw up three blanks, fasten them together and drill a central hole to fasten the lot down- or does it? With the time- and money saved, one can go to the bank to count one's loot.:hDe:
Regards
Norman