One man's Mede is another man's Persian.
An alternative to propane would be a can of refrigerant from the auto parts store. Some of the canned air dusting products may be propane as well, and liquid comes out if you use them upside down.
Put the cigarette out first, though.
Rick "who uses propane refrigerant in his old motorhome dash air conditioning" Denney
If it's working, I'd leave that part alone.
What's that old saying?
If it jams, force it.
If it breaks, it needed replacing anyway.
Keep us posted...
I like soaking parts in Marvel Mystery oil.
I've dealt with steel shafts stuck in aluminum before on a larger scale and eventually had to use vinegar to dissolve the corrosion before I could get it loose. After that a good flush with oil to displace the vinegar and I was back in business. No idea if it would work on your part.
I vote for the liquid propane only because the 4th of July is coming. Please videotape & tape the result...
I would not use propane or any other liquified flammable gas. These materials have very wide explosive ranges and very high expansion ratios, e.g. Propane is 1860:1. Never use liquid oxygen! If it comes in contact with any grease or oil, a flash fire will result! If you do use a liquified gas, I would suggest carbon dioxide. Use it in a well ventilated area. Be sure to use eye protection and suitable gloves.
"If you want nice fresh oats, you have to pay a fair price. If you can be satisfied with oats that have already been through the horse; that comes a little cheaper."