I have been seeing talk of steel liners and bolsters on some of the GECs. What are they using? I remember the Schatt heritage line had steel liners and Norway iron bolsters. I am of course familiar with the milled stainless liners on customs. I guess I am curious about strength, corrosion, and historical accuracy. I have an ulster scout with steel interior liners but brass under the scales and of course nickel silver swinden keys.