I don't recall anything special about removing those, apart from being careful. Mark their position on the shaft before removal.
This article has various RA-103 restoration notes, including tuner cleaning & lube:
http://antiqueradio.org/DuMontRA-103Television.htm
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html
P.S. Nice cleaning job.