Advice on loosening seat back-to-bottom screws

[toolboxchev]

Here is my solution to rusty stuff:

PB Blaster Penetrating Lubricant, I use a mini torch after letting the PB soak for a while. Repeat this process, PB, Heat, Cool, PB, Whack with the impact driver. Most of your manual impact drivers come with a couple of good bits.

Repeat process until its loose. It has yet to fail me. If necessary I break out the slightly bigger torch that a plumber uses with the green coleman can of propane. Use cold running water to impart a shock to the metal, this part can be important on the real stubborn stuff.

I had an old farm implement to repair once and after being frustrated many times the boss said to use the acetylene torch to heat it instead with a 3/4 inch large air impact driver on a rather large bolt.

On my 4th try after getting it glowing red then spraying it with the hose multiple times then using the PB it came loose.

That process is almost guaranteed to break any rusted nut and bolt loose.