You can, but you need to swap the yoke. Neck connectors are compatible.So you're saying I can fit the 29E31S chassis in the tube that came with the Windy II?
Also the yoke for the flat screen tube might not be the same as the one for the curved, so it might not look right in the corners.
Anyway, I've never seen a 29E31S paired with a flat screen. Interesting stuff!