OK guys, need some advice. House was built in '91, split level, bedrooms over the tuck under garage, kitchen, living, dining over the main house. We've notice the top floor shakes a bit walking around in the last couple of years, stuff rattling in the kitchen, pictures on the walls, the Wii fit really stirs things up. So in the basement under the main house, I have 2x12" floor joists running front to back (I'm NOT a carpenter by no means, so forgive my terminology please!), in the middle of those is the main joist going side to side 3x 2x16"s. In the middle of the main that is 20' long, there is a 'Strong Post', basically a metal tube post with thread on the bottom into the concrete and anchored into the main up top. Do you think that if I give the strong post a few twists that would help? The level says it is sagging a bit in the middle, but I need to know if this is ok to do and how to do it. The bottom of the strong post has a couple pins in it, I assume I need to pull those and crank the bottom edge a few times if so? Thanks gang, what I get here is better than any big box advice by far!