I have a nice copy of the 55 page HR-2510 service manual.
Price schedule:
20 wpm Extra: free
13 wpm Advanced: $5
13 wpm General: $10
5 wpm Tech+: $15
5 wpm Novice: $20
5 wpm Extra: $25
5 wpm Advanced: $30
5 wpm General: $35
0 wpm Tech: $5,000.

(Buyer also pays postage -- about $4 via Priority Mail)

73,
Jeff KH6O
--
Chief Petty Officer, U.S. Coast Guard
Mathematics Lecturer, University of Hawaii System