What open tuning for slide guitar would cause the least tension on my old guitar?
I got a really cool parlour guitar from the 1930's. I realize it is old and bridge is fragile. I am reinforcing some spots. I would like to do some fixing on it and tune it up, and actually play it. I thought I could tune it and use it like a slide guitar.
What open slide guitar tuning would cause the least tension on this old guitar?