Oh brother, I bought a group lot of fixer uppers, and the 552 rss Gruen turns out to have inteIrnals smothered in green rubbery glue. I got it mostly clean but the hairspring is still partially glued and somewhat mangled. The balance refused to spin freely and I found the face side balance hole jewel to be worn out as well as both cap jewels. I lost the balance cock hole jewel during blow drying. The estimate for the parts needed from Perrins is $50 for jewel sets and $50 for the hairspring. I'd love to see the thing run again, but I can't justify the costs.