Unfortunately, I suspect you are now in the market for a new powder thrower.
Even if you free up the rotating parts, it is never going to work to your satisfaction IMHO.
My Redding is still going after 35+ years.
The drum looks like it might be chrome plated or is polished that well.
The model I have (#3 Universal) is now called the Match-Grade Model 3BR Powder Measure.
match-grade-model-3br-powder-measure
bench-stand
It has 2 different micrometer inserts for small and large charges.
Looking around, Amazon is still offering the #3 universal for about $200.
Maybe try for a nice used one on eBay, gunbroker, or similar site?
Good luck and welcome back to reloading!
Sadly I had to take down the bench for a spell and convert it to my wife's work from home office.