I doubt the sill plate in my truck has ever been out. I wasn’t looking forward to this. Standard #2 philips head. Started with a couple of picks, cleaning out the heads. Spare screwdriver tip used as a punch to clean out the grooves and hopefully shock the screws some. Then back to the picks, rinse and repeat. Try tightening the screws then loosening. Try some heat. Just keep wiggling.
Took a couple panels off so I could see underneath. Broke out the penetrating fluid and heat. The little butane torch wasn’t cutting it, so out came the big torches.
There was a top row of six, those actually came out pretty well, all things considered.
The bottom row of four was no joy. Grabbed a die grinder with a zip cut wheel. Moved to the orange handled screwdriver.
Still no joy. Moved to the large black handled screwdriver. Got 3 of the 4 out, the fourth broke the head clean off.
All in all, out of ten frozen, covered in mud and grime, never moved in 15 years....to get nine out I consider that a victory.
I don’t have a plan to get the broken one out, that can wait for another days battle.
Steel screws in aluminum panels....not the best combination