I've got two manual typewriters and an IBM Selectric. Try using Tri-Flow on the linkage. I'm going to.
My wife and I would take that desk from you in a heartbeat. We'd made a place for it and stick either our 401a or one of our 500s in it. She all but drooled on the key board looking at your pics. Unfortunately we're a bit too far away.
Just don't leave it out in the weather to be destroyed. It's too good a unit for that.
Joe