Have a Beer and you'll be fine!!! All good my friend! How I can tell you this is because "I've" broke a few beating on them getting parts apart
Sure, as in PB Blaster? Any type of those solvents are "close" to the same thing. Believe it or not, Auto break fluid and automatic transmission fluid, 50/50 mix is some of the best solvent you can get. It will penetrate and kick @$$ quick. I learned that 40 years ago from an old Mack truck mechanic who worked in a dealership. They would mix it in a spray bottle and spray it on things needed. I believe he told me he learned it from a guy who worked on farm tractors. It's just not like buying a can of spray, you gotta mix it, but handy if you don't have PB or WD-40 around.
I've got the 281 running strong. The compression will rip your arm off. I need to order a gauge. I cleaned it up and it had no spark. New plug and cleaned the corrosion off the coil/flywheel and got spark. Dumped fuel in the carb and off she went with old gas in the tank. I put fresh gas in and barely had to touch the carb. I need to get a bar for it. The nose is siezed up on the bar that was on it. I'm a Stihl guy so I don't have husky stuff laying around
281 husky is a beast, and it's killer that you got it running for not much more than your time invested.
Does someone make a bar adapter for that size saw? I run Stihl bars on my bigger Husqvarna saws because I had all Stihl bars and matching chains lying around so an adapter made sense.